1
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Schlossberg DJ, Moore AS, Kallman JS, Lowry M, Eckart MJ, Hartouni EP, Hilsabeck TJ, Kerr SM, Kilkenny JD. Design of a multi-detector, single line-of-sight, time-of-flight system to measure time-resolved neutron energy spectra. Rev Sci Instrum 2022; 93:113528. [PMID: 36461449 DOI: 10.1063/5.0101874] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Accepted: 10/07/2022] [Indexed: 06/17/2023]
Abstract
In the dynamic environment of burning, thermonuclear deuterium-tritium plasmas, diagnosing the time-resolved neutron energy spectrum is of critical importance. Strategies exist for this diagnosis in magnetic confinement fusion plasmas, which presently have a lifetime of ∼1012 longer than inertial confinement fusion (ICF) plasmas. Here, we present a novel concept for a simple, precise, and scale-able diagnostic to measure time-resolved neutron spectra in ICF plasmas. The concept leverages general tomographic reconstruction techniques adapted to time-of-flight parameter space, and then employs an updated Monte Carlo algorithm and National Ignition Facility-relevant constraints to reconstruct the time-evolving neutron energy spectrum. Reconstructed spectra of the primary 14.028 MeV nDT peak are in good agreement with the exact synthetic spectra. The technique is also used to reconstruct the time-evolving downscattered spectrum, although the present implementation shows significantly more error.
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Affiliation(s)
- D J Schlossberg
- Lawrence Livermore National Laboratory, Livermore, California 94551-0808, USA
| | - A S Moore
- Lawrence Livermore National Laboratory, Livermore, California 94551-0808, USA
| | - J S Kallman
- Lawrence Livermore National Laboratory, Livermore, California 94551-0808, USA
| | - M Lowry
- Lawrence Livermore National Laboratory, Livermore, California 94551-0808, USA
| | - M J Eckart
- Lawrence Livermore National Laboratory, Livermore, California 94551-0808, USA
| | - E P Hartouni
- Lawrence Livermore National Laboratory, Livermore, California 94551-0808, USA
| | - T J Hilsabeck
- Lawrence Livermore National Laboratory, Livermore, California 94551-0808, USA
| | - S M Kerr
- Lawrence Livermore National Laboratory, Livermore, California 94551-0808, USA
| | - J D Kilkenny
- General Atomics, San Diego, California 92121, USA
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2
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Ivancic ST, Theobald W, Churnetski K, Michalko M, Willistein D, Bittle WA, Regan SP, Carpenter A, Trosseille C, Kilkenny JD, Raymond A, Hares JD, Dymoke-Bradshaw AKL, Rochau G, Garand D. Design of the high-yield time-gated x-ray hot-spot imager for OMEGA. Rev Sci Instrum 2022; 93:113521. [PMID: 36461552 DOI: 10.1063/5.0101673] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Accepted: 10/07/2022] [Indexed: 06/17/2023]
Abstract
Time-resolved x-ray self-emission imaging of hot spots in inertial confinement fusion experiments along several lines of sight provides critical information on the pressure and the transient morphology of the hot spot on the University of Rochester's OMEGA Laser System. At least three quasi-orthogonal lines of sight are required to infer the tomographic information of the hot spots of deuterium-tritium cryogenic layered implosions. OMEGA currently has two time-gated x-ray hot-spot imagers: the time-resolved Kirkpatrick-Baez x-ray microscope and the single-line-of-sight, time-resolved x-ray imager (SLOS-TRXI). The time-gated x-ray hot-spot imager (XRHSI) is being developed for use on OMEGA as the third line of sight for the high-yield operation of up to 4 × 1014 neutrons. XRHSI follows the SLOS-TRXI concept; however, it will have improved spatial and temporal resolutions of 5 μm and 20 ps, respectively. The simultaneous operation of the three instruments will provide 3-D reconstructions of the assembled hot-spot fuel at various times through peak thermonuclear output. The technical approach consists of a pinhole array imager and demagnifying time-dilation drift tube that are coupled to two side-by-side hybrid complementary metal-oxide semiconductor (hCMOS) image sensors. To minimize the background and to harden the diagnostics, an angled drift-tube assembly shifting the hCMOS sensors out of the direct line of sight and neutron shielding will be applied. The technical design space for the instrument will be discussed and the conceptual design will be presented.
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Affiliation(s)
- S T Ivancic
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - W Theobald
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - K Churnetski
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - M Michalko
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - D Willistein
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - W A Bittle
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - S P Regan
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - A Carpenter
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C Trosseille
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J D Kilkenny
- General Atomics, San Diego, California 92121-1122, USA
| | - A Raymond
- General Atomics, San Diego, California 92121-1122, USA
| | - J D Hares
- Kentech Instruments Ltd., Howbery Park, Wallingford OX10 8BA, United Kingdom
| | | | - G Rochau
- Sandia National Laboratories, Albuquerque, New Mexico 87123, USA
| | - D Garand
- Sydor Technologies, Fairport, New York 14450, USA
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3
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Kunimune JH, Gatu Johnson M, Moore AS, Trosseille CA, Johnson TM, Berg GPA, Mackinnon AJ, Kilkenny JD, Frenje JA. Phased plan for the implementation of the time-resolving magnetic recoil spectrometer on the National Ignition Facility (NIF). Rev Sci Instrum 2022; 93:083511. [PMID: 36050092 DOI: 10.1063/5.0100996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Accepted: 07/25/2022] [Indexed: 06/15/2023]
Abstract
The time-resolving magnetic recoil spectrometer (MRSt) is a transformative diagnostic that will be used to measure the time-resolved neutron spectrum from an inertial confinement fusion implosion at the National Ignition Facility (NIF). It uses a CD foil on the outside of the hohlraum to convert fusion neutrons to recoil deuterons. An ion-optical system positioned outside the NIF target chamber energy-disperses and focuses forward-scattered deuterons. A pulse-dilation drift tube (PDDT) subsequently dilates, un-skews, and detects the signal. While the foil and ion-optical system have been designed, the PDDT requires more development before it can be implemented. Therefore, a phased plan is presented that first uses the foil and ion-optical systems with detectors that can be implemented immediately-namely CR-39 and hDISC streak cameras. These detectors will allow the MRSt to be commissioned in an intermediate stage and begin collecting data on a reduced timescale, while the PDDT is developed in parallel. A CR-39 detector will be used in phase 1 for the measurement of the time-integrated neutron spectra with excellent energy-resolution, necessary for the energy calibration of the system. Streak cameras will be used in phase 2 for measurement of the time-resolved spectrum with limited spectral coverage, which is sufficient to diagnose the time-resolved ion temperature. Simulations are presented that predict the performance of the streak camera detector, indicating that it will achieve excellent burn history measurements at current yields, and good time-resolved ion-temperature measurements at yields above 3 × 1017. The PDDT will be used for optimal efficiency and resolution in phase 3.
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Affiliation(s)
| | | | - A S Moore
- LLNL, Livermore, California 94550, USA
| | | | - T M Johnson
- MIT PSFC, Cambridge, Massachusetts 02139, USA
| | - G P A Berg
- Department of Physics and Astronomy, Notre Dame, Indiana 46556, USA
| | | | | | - J A Frenje
- MIT PSFC, Cambridge, Massachusetts 02139, USA
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4
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MacPhee AG, Bell PM, Boyle D, Carpenter AC, Claus L, Dayton M, Dean J, Dymoke-Bradshaw AKL, Durand C, Funsten B, Garafalo A, Golick BP, Hares JD, Hill J, Kehl JM, Khan SF, Kilkenny JD, MacDonald MJ, Maheshwari D, Mccubbin IJ, Nagel SR, Nyholm PR, Palmer NE, Petre RB, Sanchez M, Schneider MB, Schoelmerich MO, Stoupin S, Welton A. Performance of a hardened x-ray streak camera at Lawrence Livermore National Laboratory's National Ignition Facility. Rev Sci Instrum 2022; 93:083519. [PMID: 36050115 DOI: 10.1063/5.0101678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Accepted: 07/16/2022] [Indexed: 06/15/2023]
Abstract
Electron tubes continue to provide the highest speeds possible for recording dynamics of hot high-energy density plasmas. Standard streak camera drive electronics and CCD readout are not compatible with the radiation environment associated with high DT fusion yield inertial confinement fusion experiments >1013 14 MeV DT neutrons or >109 n cm-2 ns-1. We describe a hardened x-ray streak camera developed for the National Ignition Facility and present preliminary results from the first experiment on which it has participated, recording the time-resolved bremsstrahlung spectrum from the core of an inertial confinement fusion implosion at more than 40× the operational neutron yield limit of the previous National Ignition Facility x-ray streak cameras.
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Affiliation(s)
- Andrew G MacPhee
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - Perry M Bell
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - Dusty Boyle
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - Arthur C Carpenter
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - Liam Claus
- Sandia National Laboratory, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - Matthew Dayton
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - Jack Dean
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | | | - Cassandra Durand
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - Brad Funsten
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - Anne Garafalo
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - Brad P Golick
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - Jonathan D Hares
- Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire OX10 8BD, United Kingdom
| | - Jeremy Hill
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - Justin M Kehl
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - Shahab F Khan
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - J D Kilkenny
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA
| | - Mike J MacDonald
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - Devon Maheshwari
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - Ian J Mccubbin
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - Sabrina R Nagel
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - Peter R Nyholm
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - Nathan E Palmer
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - Robert B Petre
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - Marcos Sanchez
- Sandia National Laboratory, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - Marilyn B Schneider
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - Markus O Schoelmerich
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - Stanislav Stoupin
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - Adrianne Welton
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
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5
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Berg GPA, Frenje JA, Kunimune JH, Trosseille CA, Couder M, Kilkenny JD, Mackinnon AJ, Moore AS, Waltz CS, Wiescher MC. Design of the ion-optics for the MRSt neutron spectrometer at the National Ignition Facility (NIF). Rev Sci Instrum 2022; 93:033505. [PMID: 35364969 DOI: 10.1063/5.0080991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Accepted: 03/07/2022] [Indexed: 06/14/2023]
Abstract
A new Magnetic Recoil Spectrometer (MRSt) is designed to provide time-resolved measurements of the energy spectrum of neutrons emanating from an inertial confinement fusion implosion at the National Ignition Facility. At present, time integrated parameters are being measured using the existing magnet recoil and neutron time-of-flight spectrometers. The capability of high energy resolution of 2 keV and the extension to high time resolution of about 20 ps are expected to improve our understanding of conditions required for successful fusion experiments. The layout, ion-optics, and specifications of the MRSt will be presented.
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Affiliation(s)
- G P A Berg
- Department of Physics, Notre Dame College of Science, Notre Dame, Indiana 46556, USA
| | - J A Frenje
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - J H Kunimune
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - C A Trosseille
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M Couder
- Department of Physics, Notre Dame College of Science, Notre Dame, Indiana 46556, USA
| | - J D Kilkenny
- General Atomics, San Diego, California 92186, USA
| | - A J Mackinnon
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A S Moore
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C S Waltz
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M C Wiescher
- Department of Physics, Notre Dame College of Science, Notre Dame, Indiana 46556, USA
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6
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Schlossberg DJ, Grim GP, Casey DT, Moore AS, Nora R, Bachmann B, Benedetti LR, Bionta RM, Eckart MJ, Field JE, Fittinghoff DN, Gatu Johnson M, Geppert-Kleinrath V, Hartouni EP, Hatarik R, Hsing WW, Jarrott LC, Khan SF, Kilkenny JD, Landen OL, MacGowan BJ, Mackinnon AJ, Meaney KD, Munro DH, Nagel SR, Pak A, Patel PK, Spears BK, Volegov PL, Young CV. Observation of Hydrodynamic Flows in Imploding Fusion Plasmas on the National Ignition Facility. Phys Rev Lett 2021; 127:125001. [PMID: 34597087 DOI: 10.1103/physrevlett.127.125001] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 06/06/2021] [Accepted: 07/08/2021] [Indexed: 06/13/2023]
Abstract
Inertial confinement fusion implosions designed to have minimal fluid motion at peak compression often show significant linear flows in the laboratory, attributable per simulations to percent-level imbalances in the laser drive illumination symmetry. We present experimental results which intentionally varied the mode 1 drive imbalance by up to 4% to test hydrodynamic predictions of flows and the resultant imploded core asymmetries and performance, as measured by a combination of DT neutron spectroscopy and high-resolution x-ray core imaging. Neutron yields decrease by up to 50%, and anisotropic neutron Doppler broadening increases by 20%, in agreement with simulations. Furthermore, a tracer jet from the capsule fill-tube perturbation that is entrained by the hot-spot flow confirms the average flow speeds deduced from neutron spectroscopy.
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Affiliation(s)
- D J Schlossberg
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - G P Grim
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D T Casey
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A S Moore
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Nora
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B Bachmann
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - L R Benedetti
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R M Bionta
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M J Eckart
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J E Field
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D N Fittinghoff
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M Gatu Johnson
- Massachusetts Institute of Technology Plasma Science and Fusion Center, Cambridge, Massachusetts 02139, USA
| | | | - E P Hartouni
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Hatarik
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - W W Hsing
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - L C Jarrott
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S F Khan
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J D Kilkenny
- General Atomics, La Jolla, California 92121, USA
| | - O L Landen
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B J MacGowan
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A J Mackinnon
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - K D Meaney
- Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA
| | - D H Munro
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S R Nagel
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Pak
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - P K Patel
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B K Spears
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - P L Volegov
- Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA
| | - C V Young
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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7
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Kunimune JH, Frenje JA, Berg GPA, Trosseille CA, Nora RC, Waltz CS, Moore AS, Kilkenny JD, Mackinnon AJ. Top-level physics requirements and simulated performance of the MRSt on the National Ignition Facility. Rev Sci Instrum 2021; 92:033514. [PMID: 33820013 DOI: 10.1063/5.0040745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 02/05/2021] [Indexed: 06/12/2023]
Abstract
The time-resolving Magnetic Recoil Spectrometer (MRSt) for the National Ignition Facility (NIF) has been identified by the US National Diagnostic Working Group as one of the transformational diagnostics that will reshape the way inertial confinement fusion (ICF) implosions are diagnosed. The MRSt will measure the time-resolved neutron spectrum of an implosion, from which the time-resolved ion temperature, areal density, and yield will be inferred. Top-level physics requirements for the MRSt were determined based on simulations of numerous ICF implosions with varying degrees of alpha heating, P2 asymmetry, and mix. Synthetic MRSt data were subsequently generated for different configurations using Monte-Carlo methods to determine its performance in relation to the requirements. The system was found to meet most requirements at current neutron yields at the NIF. This work was supported by the DOE and LLNL.
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Affiliation(s)
- J H Kunimune
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - J A Frenje
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - G P A Berg
- Department of Physics, Notre Dame College of Science, Notre Dame, Indiana 46556, USA
| | - C A Trosseille
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R C Nora
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C S Waltz
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A S Moore
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J D Kilkenny
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A J Mackinnon
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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8
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Hall GN, Krauland CM, Schollmeier MS, Kemp GE, Buscho JG, Hibbard R, Thompson N, Casco ER, Ayers MJ, Ayers SL, Meezan NB, Hopkins LFB, Nora R, Hammel BA, Masse L, Field JE, Bradley DK, Bell P, Landen OL, Kilkenny JD, Mariscal D, Park J, McCarville TJ, Lowe-Webb R, Kalantar D, Kohut T, Piston K. The Crystal Backlighter Imager: A spherically bent crystal imager for radiography on the National Ignition Facility. Rev Sci Instrum 2019; 90:013702. [PMID: 30709218 DOI: 10.1063/1.5058700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Accepted: 12/17/2018] [Indexed: 06/09/2023]
Abstract
The Crystal Backlighter Imager (CBI) is a quasi-monochromatic, near-normal incidence, spherically bent crystal imager developed for the National Ignition Facility (NIF), which will allow inertial confinement fusion capsule implosions to be radiographed close to stagnation. This is not possible using the standard pinhole-based area-backlighter configuration, as the self-emission from the capsule hotspot overwhelms the backlighter signal in the final stages of the implosion. The CBI mitigates the broadband self-emission from the capsule hot spot by using the extremely narrow bandwidth inherent to near-normal-incidence Bragg diffraction. Implementing a backlighter system based on near-normal reflection in the NIF chamber presents unique challenges, requiring the CBI to adopt novel engineering and operational strategies. The CBI currently operates with an 11.6 keV backlighter, making it the highest energy radiography diagnostic based on spherically bent crystals to date. For a given velocity, Doppler shift is proportional to the emitted photon energy. At 11.6 keV, the ablation velocity of the backlighter plasma results in a Doppler shift that is significant compared to the bandwidth of the instrument and the width of the atomic line, requiring that the shift be measured to high accuracy and the optics aligned accordingly to compensate. Experiments will be presented that used the CBI itself to measure the backlighter Doppler shift to an accuracy of better than 1 eV. These experiments also measured the spatial resolution of CBI radiographs at 7.0 μm, close to theoretical predictions. Finally, results will be presented from an experiment in which the CBI radiographed a capsule implosion driven by a 1 MJ NIF laser pulse, demonstrating a significant (>100) improvement in the backlighter to self-emission ratio compared to the pinhole-based area-backlighter configuration.
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Affiliation(s)
- G N Hall
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - C M Krauland
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA
| | - M S Schollmeier
- Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
| | - G E Kemp
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - J G Buscho
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - R Hibbard
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - N Thompson
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - E R Casco
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - M J Ayers
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - S L Ayers
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - N B Meezan
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - L F Berzak Hopkins
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - R Nora
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - B A Hammel
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - L Masse
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - J E Field
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - D K Bradley
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - P Bell
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - O L Landen
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - J D Kilkenny
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA
| | - D Mariscal
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - J Park
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - T J McCarville
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - R Lowe-Webb
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - D Kalantar
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - T Kohut
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - K Piston
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
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9
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Parker CE, Frenje JA, Johnson MG, Schlossberg DJ, Reynolds HG, Hopkins LB, Bionta R, Casey DT, Felker SJ, Hilsabeck TJ, Kilkenny JD, Li CK, Mackinnon AJ, Robey H, Schoff ME, Séguin FH, Wink CW, Petrasso RD. Implementation of the foil-on-hohlraum technique for the magnetic recoil spectrometer for time-resolved neutron measurements at the National Ignition Facility. Rev Sci Instrum 2018; 89:113508. [PMID: 30501287 DOI: 10.1063/1.5052184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Accepted: 11/02/2018] [Indexed: 06/09/2023]
Abstract
The next-generation Magnetic Recoil Spectrometer, called MRSt, will provide time-resolved measurements of the deuterium-tritium-neutron spectrum from inertial confinement fusion implosions at the National Ignition Facility. These measurements will provide critical information about the time evolution of the fuel assembly, hot-spot formation, and nuclear burn. The absolute neutron spectrum in the energy range of 12-16 MeV will be measured with high accuracy (∼5%), unprecedented energy resolution (∼100 keV) and, for the first time ever, time resolution (∼20 ps). Crucial to the design of the system is a CD conversion foil for the production of recoil deuterons positioned as close to the implosion as possible. The foil-on-hohlraum technique has been demonstrated by placing a 1-mm-diameter, 40-μm-thick CD foil on the hohlraum diagnostic band along the line-of-sight of the current time-integrated MRS system, which measured the recoil deuterons. In addition to providing validation of the foil-on-hohlraum technique for the MRSt design, substantial improvement of the MRS energy resolution has been demonstrated.
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Affiliation(s)
- C E Parker
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - J A Frenje
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - M Gatu Johnson
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - D J Schlossberg
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - H G Reynolds
- General Atomics, San Diego, California 92186, USA
| | - L Berzak Hopkins
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Bionta
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D T Casey
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S J Felker
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | | | - J D Kilkenny
- General Atomics, San Diego, California 92186, USA
| | - C K Li
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - A J Mackinnon
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - H Robey
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M E Schoff
- General Atomics, San Diego, California 92186, USA
| | - F H Séguin
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - C W Wink
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - R D Petrasso
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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10
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Dymoke-Bradshaw AKL, Hares JD, Milnes J, Herrmann HW, Horsfield CJ, Gales SG, Leatherland A, Hilsabeck T, Kilkenny JD. Development of an ultra-fast photomultiplier tube for gamma-ray Cherenkov detectors at the National Ignition Facility (PD-PMT). Rev Sci Instrum 2018; 89:10I137. [PMID: 30399690 DOI: 10.1063/1.5039327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 06/27/2018] [Indexed: 06/08/2023]
Abstract
A new ultra-fast photomultiplier tube and associated drivers have been developed for use in the next generation of gamma-ray high pressure gas Cherenkov detectors for inertial confinement fusion experiments at the National Ignition Facility. Pulse-dilation technology has been applied to a standard micro-channel-plate-based photomultiplier tube to improve the temporal response by about 10×. The tube has been packaged suitably for deployment on the National Ignition Facility, and remote electronics have been designed to deliver the required non-linear waveforms to the pulse dilation electrode. This is achieved with an avalanche pulse generator system capable of generating fast arbitrary waveforms over the useful parameter space. The pulse is delivered via fast impedance-matching transformers and isolators, allowing the cathode to be ramped on a sub-nanosecond time scale between two high voltages in a controlled non-linear manner. This results in near linear pulse dilation over several ns. The device has a built-in fiducial system that allows easy calibration and testing with fiber optic laser sources. Results are presented demonstrating the greatly improved response time and other parameters of the device.
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Affiliation(s)
| | - J D Hares
- Kentech Instruments Ltd., Oxfordshire OX10 8BD, United Kingdom
| | - J Milnes
- Photek Ltd., St Leonards on Sea TN38 9NS, United Kingdom
| | - H W Herrmann
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - C J Horsfield
- Atomic Weapons Establishment, Aldermaston, Berkshire RG7 4PR, United Kingdom
| | - S G Gales
- Atomic Weapons Establishment, Aldermaston, Berkshire RG7 4PR, United Kingdom
| | - A Leatherland
- Atomic Weapons Establishment, Aldermaston, Berkshire RG7 4PR, United Kingdom
| | - T Hilsabeck
- General Atomics, San Diego, California 92186, USA
| | - J D Kilkenny
- General Atomics, San Diego, California 92186, USA
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11
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Khan SF, Jarrott LC, Patel PK, Izumi N, Ma T, MacPhee AG, Hatch B, Landen OL, Heinmiller J, Kilkenny JD, Bradley DK. Implementing time resolved electron temperature capability at the NIF using a streak camera. Rev Sci Instrum 2018; 89:10K117. [PMID: 30399814 DOI: 10.1063/1.5039382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 09/05/2018] [Indexed: 06/08/2023]
Abstract
A new capability at the National Ignition Facility (NIF) has been implemented to measure the temperature of x-ray emitting sources. Although it is designed primarily for Inertial Confinement Fusion (ICF), it can be used for any hot emitting source that is well modeled. The electron temperature (Te) of the hot spot within the core of imploded ICF capsules is an effective indicator of implosion performance. Currently, there are spatially and temporally integrated Te inferences using image plates. A temporally resolved measurement of Te will help elucidate the mechanisms for hot spot heating and cooling such as conduction to fuel, alpha-heating, mix, and radiative losses. To determine the temporally resolved Te of hot spots, specific filters are added to an existing x-ray streak camera "streaked polar instrumentation for diagnosing energetic radiation" to probe the emission spectrum during the x-ray burn history of implosions at the NIF. One of the difficulties in inferring the hot spot temperature is the attenuation of the emission due to opacity from the shell and fuel. Therefore, a series of increasingly thick titanium filters were implemented to isolate the emission in specific energy regions that are sensitive to temperatures above 3 keV while not significantly influenced by the shell/fuel attenuation. Additionally, a relatively thin zinc filter was used to measure the contribution of colder emission sources. Since the signal levels of the emission through the thicker filters are relatively poor, a dual slit (aperture) was designed to increase the detected signal at the higher end of the spectrum. Herein, the design of the filters and slit is described, an overview of the solving technique is provided, and the initial electron temperature results are reported.
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Affiliation(s)
- S F Khan
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - L C Jarrott
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - P K Patel
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - N Izumi
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - T Ma
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A G MacPhee
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B Hatch
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - O L Landen
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J Heinmiller
- Nevada National Security Site, Livermore, California 94551, USA
| | - J D Kilkenny
- General Atomics, San Diego, California 92121, USA
| | - D K Bradley
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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12
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Theobald W, Sorce C, Bedzyk M, Ivancic ST, Marshall FJ, Stoeckl C, Shah RC, Lawrie M, Regan SP, Sangster TC, Campbell EM, Hilsabeck TJ, Englehorn K, Kilkenny JD, Morris D, Chung TM, Hares JD, Dymoke-Bradshaw AKL, Bell P, Celeste J, Carpenter AC, Dayton M, Bradley DK, Jackson MC, Pickworth L, Nagel SR, Rochau G, Porter J, Sanchez M, Claus L, Robertson G, Looker Q. The single-line-of-sight, time-resolved x-ray imager diagnostic on OMEGA. Rev Sci Instrum 2018; 89:10G117. [PMID: 30399700 DOI: 10.1063/1.5036767] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Accepted: 06/25/2018] [Indexed: 06/08/2023]
Abstract
The single-line-of-sight, time-resolved x-ray imager (SLOS-TRXI) on OMEGA is one of a new generation of fast-gated x-ray cameras comprising an electron pulse-dilation imager and a nanosecond-gated, burst-mode, hybrid complementary metal-oxide semiconductor sensor. SLOS-TRXI images the core of imploded cryogenic deuterium-tritium shells in inertial confinement fusion experiments in the ∼4- to 9-keV photon energy range with a pinhole imager onto a photocathode. The diagnostic is mounted on a fixed port almost perpendicular to a 16-channel, framing-camera-based, time-resolved Kirkpatrick-Baez microscope, providing a second time-gated line of sight for hot-spot imaging on OMEGA. SLOS-TRXI achieves ∼40-ps temporal resolution and better than 10-μm spatial resolution. Shots with neutron yields of up to 1 × 1014 were taken without observed neutron-induced background signal. The implosion images from SLOS-TRXI show the evolution of the stagnating core.
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Affiliation(s)
- W Theobald
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - C Sorce
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - M Bedzyk
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - S T Ivancic
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - F J Marshall
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - C Stoeckl
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - R C Shah
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - M Lawrie
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - S P Regan
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - T C Sangster
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - E M Campbell
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - T J Hilsabeck
- General Atomics, San Diego, California 92121-1122, USA
| | - K Englehorn
- General Atomics, San Diego, California 92121-1122, USA
| | - J D Kilkenny
- General Atomics, San Diego, California 92121-1122, USA
| | - D Morris
- General Atomics, San Diego, California 92121-1122, USA
| | - T M Chung
- TMC2 Innovations LLC, Murrieta, California 92563-7890, USA
| | - J D Hares
- Kentech Instruments Ltd., Howbery Park, Wallingford, Oxfordshire OX10 8BA, United Kingdom
| | - A K L Dymoke-Bradshaw
- Kentech Instruments Ltd., Howbery Park, Wallingford, Oxfordshire OX10 8BA, United Kingdom
| | - P Bell
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J Celeste
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A C Carpenter
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M Dayton
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D K Bradley
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M C Jackson
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - L Pickworth
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S R Nagel
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - G Rochau
- Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
| | - J Porter
- Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
| | - M Sanchez
- Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
| | - L Claus
- Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
| | - G Robertson
- Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
| | - Q Looker
- Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
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13
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Geppert-Kleinrath H, Herrmann HW, Kim YH, Zylstra AB, Meaney K, Lopez FE, Pederson BJ, Carrera J, Khater H, Horsfield CJ, Rubery MS, Gales S, Leatherland A, Meadowcroft A, Hilsabeck T, Kilkenny JD, Malone RM, Hares JD, Dymoke-Bradshaw AKL, Milnes J, McFee C. Pulse dilation gas Cherenkov detector for ultra-fast gamma reaction history at the NIF (invited). Rev Sci Instrum 2018; 89:10I146. [PMID: 30399731 DOI: 10.1063/1.5039377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 06/11/2018] [Indexed: 06/08/2023]
Abstract
The Cherenkov mechanism used in Gas Cherenkov Detectors (GCDs) is exceptionally fast. However, the temporal resolution of GCDs, such as the Gamma Reaction History diagnostic at the National Ignition Facility (NIF), has been limited by the current state-of-the-art photomultiplier tube technology to ∼100 ps. The soon-to-be deployed Pulse Dilation Photomultiplier Tube (PD-PMT) at NIF will allow for temporal resolution comparable to that of the gas cell or ∼10 ps. Enhanced resolution will contribute to the quest for ignition in a crucial way through precision measurements of reaction history and ablator areal density (ρR) history, leading to better constrained models. Features such as onset of alpha heating, shock reverberations, and burn truncation due to dynamically evolving failure modes may become visible for the first time. Test measurements of the PD-PMT at Atomic Weapons Establishment confirmed that design goals have been met. The PD-PMT provides dilation factors of 2 to 40× in 6 increments. The GCD-3 recently deployed at the NIF has been modified for coupling to a PD-PMT and will soon be making ultrafast measurements.
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Affiliation(s)
| | - H W Herrmann
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Y H Kim
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - A B Zylstra
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - K Meaney
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - F E Lopez
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - B J Pederson
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - J Carrera
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - H Khater
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C J Horsfield
- Atomic Weapons Establishment, Aldermaston, Berkshire RG7 4PR, United Kingdom
| | - M S Rubery
- Atomic Weapons Establishment, Aldermaston, Berkshire RG7 4PR, United Kingdom
| | - S Gales
- Atomic Weapons Establishment, Aldermaston, Berkshire RG7 4PR, United Kingdom
| | - A Leatherland
- Atomic Weapons Establishment, Aldermaston, Berkshire RG7 4PR, United Kingdom
| | - A Meadowcroft
- Atomic Weapons Establishment, Aldermaston, Berkshire RG7 4PR, United Kingdom
| | - T Hilsabeck
- General Atomics, San Diego, California 92186, USA
| | - J D Kilkenny
- General Atomics, San Diego, California 92186, USA
| | - R M Malone
- Misson Support and Test Services, LLC, Los Alamos, New Mexico 87544, USA
| | - J D Hares
- Kentech Instruments Ltd., Wallingford, Oxfordshire OX10 8BD, United Kingdom
| | | | - J Milnes
- Photeck Ltd., St Leonards-on-Sea, East Sussex TN38 9NS, United Kingdom
| | - C McFee
- Sydor Technologies, Rochester, New York 14624, USA
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14
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Herrmann HW, Kim YH, Zylstra AB, Geppert-Kleinrath H, Meaney KD, Young CS, Lopez FE, Fatherley VE, Pederson BJ, Oertel JA, Hernandez JE, Carrera J, Khater H, Rubery MS, Horsfield CJ, Gales S, Leatherland A, Hilsabeck T, Kilkenny JD, Malone RM, Batha SH. Progress on next generation gamma-ray Cherenkov detectors for the National Ignition Facility. Rev Sci Instrum 2018; 89:10I148. [PMID: 30399772 DOI: 10.1063/1.5039378] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 06/25/2018] [Indexed: 06/08/2023]
Abstract
Fusion reaction history and ablator areal density measurements for Inertial Confinement Fusion experiments at the National Ignition Facility are currently conducted using the Gamma Reaction History diagnostic (GRH_6m). Future Gas Cherenkov Detectors (GCDs) will ultimately provide ∼100x more sensitivity, reduce the effective temporal response from ∼100 to ∼10 ps, and lower the energy threshold from 2.9 to 1.8 MeV, relative to GRH_6m. The first phase toward next generation GCDs consisted of inserting the existing coaxial GCD-3 detector into a reentrant well which puts it within 4 m of the implosion. Reaction history and ablator gamma measurement results from this Phase I are discussed here. These results demonstrate viability for the follow-on Phases of (II) the use of a revolutionary new pulse-dilation photomultiplier tube to improve the effective measurement bandwidth by >10x relative to current PMT technology; and (III) the design of a NIF-specific "Super" GCD which will be informed by the assessment of the radiation background environment within the well described here.
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Affiliation(s)
- H W Herrmann
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Y H Kim
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - A B Zylstra
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | | | - K D Meaney
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - C S Young
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - F E Lopez
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - V E Fatherley
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - B J Pederson
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - J A Oertel
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - J E Hernandez
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J Carrera
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - H Khater
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M S Rubery
- Atomic Weapons Establishment, Aldermaston, Berkshire RG7 4PR, United Kingdom
| | - C J Horsfield
- Atomic Weapons Establishment, Aldermaston, Berkshire RG7 4PR, United Kingdom
| | - S Gales
- Atomic Weapons Establishment, Aldermaston, Berkshire RG7 4PR, United Kingdom
| | - A Leatherland
- Atomic Weapons Establishment, Aldermaston, Berkshire RG7 4PR, United Kingdom
| | - T Hilsabeck
- General Atomics, San Diego, California 92186, USA
| | - J D Kilkenny
- General Atomics, San Diego, California 92186, USA
| | - R M Malone
- Mission Support and Test Services, LLC, Los Alamos, New Mexico 87544, USA
| | - S H Batha
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
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15
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Barrios MA, Moody JD, Suter LJ, Sherlock M, Chen H, Farmer W, Jaquez J, Jones O, Kauffman RL, Kilkenny JD, Kroll J, Landen OL, Liedahl DA, Maclaren SA, Meezan NB, Nikroo A, Schneider MB, Thorn DB, Widmann K, Pérez-Callejo G. Developing an Experimental Basis for Understanding Transport in NIF Hohlraum Plasmas. Phys Rev Lett 2018; 121:095002. [PMID: 30230893 DOI: 10.1103/physrevlett.121.095002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2018] [Revised: 07/22/2018] [Indexed: 06/08/2023]
Abstract
We report on the first multilocation electron temperature (T_{e}) and flow measurements in an ignition hohlraum at the National Ignition Facility using the novel technique of mid-Z spectroscopic tracer "dots." The measurements define a low resolution "map" of hohlraum plasma conditions and provide a basis for the first multilocation tests of particle and energy transport physics in a laser-driven x-ray cavity. The data set is consistent with classical heat flow near the capsule but reduced heat flow near the laser entrance hole. We evaluate the role of kinetic effects, self-generated magnetic fields, and instabilities in causing spatially dependent heat transport in the hohlraum.
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Affiliation(s)
| | - J D Moody
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - L J Suter
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - M Sherlock
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - H Chen
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - W Farmer
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - J Jaquez
- General Atomics, San Diego, California 92186, USA
| | - O Jones
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - R L Kauffman
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - J D Kilkenny
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - J Kroll
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - O L Landen
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - D A Liedahl
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - S A Maclaren
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - N B Meezan
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - A Nikroo
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - M B Schneider
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - D B Thorn
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - K Widmann
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - G Pérez-Callejo
- Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom
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16
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Gales SG, Horsfield CJ, Meadowcroft AL, Leatherland AE, Herrmann HW, Hares JD, Dymoke-Bradshaw AKL, Milnes JS, Kim YH, Kleinrath HG, Meaney K, Zylstra AB, Parker S, Hussey D, Wilson L, James SF, Kilkenny JD, Hilsabeck TJ. Characterisation of a sub-20 ps temporal resolution pulse dilation photomultiplier tube. Rev Sci Instrum 2018; 89:063506. [PMID: 29960515 DOI: 10.1063/1.5031110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A pulse-dilation photomultiplier tube (PD-PMT) with sub-20 ps temporal resolution has been developed for use with γ-ray-sensitive gas Cherenkov detectors at the National Ignition Facility to improve the diagnosis of nuclear fusion burn history and the areal density of the remaining capsule ablator. The pulse-dilation mechanism entails the application of a time-dependent, ramp waveform to a photocathode-mesh structure, introducing a time-dependent photoelectron accelerating potential. The electric field imparts axial velocity dispersion to outgoing photoelectrons. The photoelectron pulse is dilated as it transits a drift region prior to amplification in a microchannel plate and read out with a digital oscilloscope. We report the first measurements with the prototype PD-PMT demonstrating nominal <20 ps FWHM across a 400 ps measurement window and <30 ps FWHM for an extracted charge up to 300 pC. The output peak areas are linear to within 20% over 3 orders of magnitude of input intensity. 3D particle in cell simulations, which included space charge effects, have been carried out to investigate the device temporal magnification, resolution, and linearity.
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Affiliation(s)
- S G Gales
- AWE plc, Aldermaston, Reading RG7 4PR, United Kingdom
| | - C J Horsfield
- AWE plc, Aldermaston, Reading RG7 4PR, United Kingdom
| | | | | | - H W Herrmann
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - J D Hares
- Kentech Instruments Ltd., Wallingford OX10 8BD, United Kingdom
| | | | - J S Milnes
- Photek Ltd., St Leonards-on-Sea TN38 9NS, United Kingdom
| | - Y H Kim
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - H G Kleinrath
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - K Meaney
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - A B Zylstra
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - S Parker
- AWE plc, Aldermaston, Reading RG7 4PR, United Kingdom
| | - D Hussey
- AWE plc, Aldermaston, Reading RG7 4PR, United Kingdom
| | - L Wilson
- AWE plc, Aldermaston, Reading RG7 4PR, United Kingdom
| | - S F James
- AWE plc, Aldermaston, Reading RG7 4PR, United Kingdom
| | - J D Kilkenny
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA
| | - T J Hilsabeck
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA
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17
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Kilkenny JD, Bell PM, Bradley DK, Bleuel DL, Caggiano JA, Dewald EL, Hsing WW, Kalantar DH, Kauffman RL, Larson DJ, Moody JD, Schneider DH, Schneider MB, Shaughnessy DA, Shelton RT, Stoeffl W, Widmann K, Yeamans CB, Batha SH, Grim GP, Herrmann HW, Merrill FE, Leeper RJ, Oertel JA, Sangster TC, Edgell DH, Hohenberger M, Glebov VY, Regan SP, Frenje JA, Gatu-Johnson M, Petrasso RD, Rinderknecht HG, Zylstra AB, Cooper GW, Ruizf C. The National Ignition Facility Diagnostic Set at the Completion of the National Ignition Campaign, September 2012. Fusion Science and Technology 2017. [DOI: 10.13182/fst15-173] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
| | - P. M. Bell
- Lawrence Livermore National Laboratory, Livermore, California 94550
| | - D. K. Bradley
- Lawrence Livermore National Laboratory, Livermore, California 94550
| | - D. L. Bleuel
- Lawrence Livermore National Laboratory, Livermore, California 94550
| | - J. A. Caggiano
- Lawrence Livermore National Laboratory, Livermore, California 94550
| | - E. L. Dewald
- Lawrence Livermore National Laboratory, Livermore, California 94550
| | - W. W. Hsing
- Lawrence Livermore National Laboratory, Livermore, California 94550
| | - D. H. Kalantar
- Lawrence Livermore National Laboratory, Livermore, California 94550
| | - R. L. Kauffman
- Lawrence Livermore National Laboratory, Livermore, California 94550
| | - D. J. Larson
- Lawrence Livermore National Laboratory, Livermore, California 94550
| | - J. D. Moody
- Lawrence Livermore National Laboratory, Livermore, California 94550
| | - D. H. Schneider
- Lawrence Livermore National Laboratory, Livermore, California 94550
| | - M. B. Schneider
- Lawrence Livermore National Laboratory, Livermore, California 94550
| | | | - R. T. Shelton
- Lawrence Livermore National Laboratory, Livermore, California 94550
| | - W. Stoeffl
- Lawrence Livermore National Laboratory, Livermore, California 94550
| | - K. Widmann
- Lawrence Livermore National Laboratory, Livermore, California 94550
| | - C. B. Yeamans
- Lawrence Livermore National Laboratory, Livermore, California 94550
| | - S. H. Batha
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545
| | - G. P. Grim
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545
| | - H. W. Herrmann
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545
| | - F. E. Merrill
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545
| | - R. J. Leeper
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545
| | - J. A. Oertel
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545
| | - T. C. Sangster
- Laboratory for Laser Energetics, Rochester, New York 14623
| | - D. H. Edgell
- Laboratory for Laser Energetics, Rochester, New York 14623
| | - M. Hohenberger
- Laboratory for Laser Energetics, Rochester, New York 14623
| | - V. Yu. Glebov
- Laboratory for Laser Energetics, Rochester, New York 14623
| | - S. P. Regan
- Laboratory for Laser Energetics, Rochester, New York 14623
| | - J. A. Frenje
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
| | - M. Gatu-Johnson
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
| | - R. D. Petrasso
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
| | | | - A. B. Zylstra
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
| | - G. W. Cooper
- Sandia National Laboratories, Albuquerque, New Mexico 87123
| | - C. Ruizf
- Sandia National Laboratories, Albuquerque, New Mexico 87123
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18
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Wink CW, Frenje JA, Hilsabeck TJ, Bionta R, Khater HY, Gatu Johnson M, Kilkenny JD, Li CK, Séguin FH, Petrasso RD. Signal and background considerations for the MRSt on the National Ignition Facility (NIF). Rev Sci Instrum 2016; 87:11D808. [PMID: 27910587 DOI: 10.1063/1.4958938] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A Magnetic Recoil Spectrometer (MRSt) has been conceptually designed for time-resolved measurements of the neutron spectrum at the National Ignition Facility. Using the MRSt, the goals are to measure the time-evolution of the spectrum with a time resolution of ∼20-ps and absolute accuracy better than 5%. To meet these goals, a detailed understanding and optimization of the signal and background characteristics are required. Through ion-optics, MCNP simulations, and detector-response calculations, it is demonstrated that the goals and a signal-to background >5-10 for the down-scattered neutron measurement are met if the background, consisting of ambient neutrons and gammas, at the MRSt is reduced 50-100 times.
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Affiliation(s)
- C W Wink
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - J A Frenje
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | | | - R Bionta
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - H Y Khater
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M Gatu Johnson
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - J D Kilkenny
- General Atomics, San Diego, California 92186, USA
| | - C K Li
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - F H Séguin
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - R D Petrasso
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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19
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MacPhee AG, Dymoke-Bradshaw AKL, Hares JD, Hassett J, Hatch BW, Meadowcroft AL, Bell PM, Bradley DK, Datte PS, Landen OL, Palmer NE, Piston KW, Rekow VV, Hilsabeck TJ, Kilkenny JD. Improving the off-axis spatial resolution and dynamic range of the NIF X-ray streak cameras (invited). Rev Sci Instrum 2016; 87:11E202. [PMID: 27910532 DOI: 10.1063/1.4960376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report simulations and experiments that demonstrate an increase in spatial resolution of the NIF core diagnostic x-ray streak cameras by at least a factor of two, especially off axis. A design was achieved by using a corrector electron optic to flatten the field curvature at the detector plane and corroborated by measurement. In addition, particle in cell simulations were performed to identify the regions in the streak camera that contribute the most to space charge blurring. These simulations provide a tool for convolving synthetic pre-shot spectra with the instrument function so signal levels can be set to maximize dynamic range for the relevant part of the streak record.
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Affiliation(s)
- A G MacPhee
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - A K L Dymoke-Bradshaw
- Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire OX10 8BD, United Kingdom
| | - J D Hares
- Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire OX10 8BD, United Kingdom
| | - J Hassett
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - B W Hatch
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | | | - P M Bell
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - D K Bradley
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - P S Datte
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - O L Landen
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - N E Palmer
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - K W Piston
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - V V Rekow
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - T J Hilsabeck
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA
| | - J D Kilkenny
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA
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20
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Frenje JA, Hilsabeck TJ, Wink CW, Bell P, Bionta R, Cerjan C, Gatu Johnson M, Kilkenny JD, Li CK, Séguin FH, Petrasso RD. The magnetic recoil spectrometer (MRSt) for time-resolved measurements of the neutron spectrum at the National Ignition Facility (NIF). Rev Sci Instrum 2016; 87:11D806. [PMID: 27910467 DOI: 10.1063/1.4959164] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The next-generation magnetic recoil spectrometer for time-resolved measurements of the neutron spectrum has been conceptually designed for the National Ignition Facility. This spectrometer, called MRSt, represents a paradigm shift in our thinking about neutron spectrometry for inertial confinement fusion applications, as it will provide simultaneously information about the burn history and time evolution of areal density (ρR), apparent ion temperature (Ti), yield (Yn), and macroscopic flows during burn. From this type of data, an assessment of the evolution of the fuel assembly, hotspot, and alpha heating can be made. According to simulations, the MRSt will provide accurate data with a time resolution of ∼20 ps and energy resolution of ∼100 keV for total neutron yields above ∼1016. At lower yields, the diagnostic will be operated at a higher-efficiency, lower-energy-resolution mode to provide a time resolution of ∼20 ps.
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Affiliation(s)
- J A Frenje
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | | | - C W Wink
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - P Bell
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Bionta
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C Cerjan
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M Gatu Johnson
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - J D Kilkenny
- General Atomics, San Diego, California 92186, USA
| | - C K Li
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - F H Séguin
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - R D Petrasso
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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21
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Herrmann HW, Kim YH, McEvoy AM, Zylstra AB, Young CS, Lopez FE, Griego JR, Fatherley VE, Oertel JA, Stoeffl W, Khater H, Hernandez JE, Carpenter A, Rubery MS, Horsfield CJ, Gales S, Leatherland A, Hilsabeck T, Kilkenny JD, Malone RM, Hares JD, Milnes J, Shmayda WT, Stoeckl C, Batha SH. Next generation gamma-ray Cherenkov detectors for the National Ignition Facility. Rev Sci Instrum 2016; 87:11E732. [PMID: 27910331 DOI: 10.1063/1.4962059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The newest generation of Gas Cherenkov Detector (GCD-3) employed in Inertial Confinement Fusion experiments at the Omega Laser Facility has provided improved performance over previous generations. Comparison of reaction histories measured using two different deuterium-tritium fusion products, namely gamma rays using GCD and neutrons using Neutron Temporal Diagnostic (NTD), have provided added credibility to both techniques. GCD-3 is now being brought to the National Ignition Facility (NIF) to supplement the existing Gamma Reaction History (GRH-6m) located 6 m from target chamber center (TCC). Initially it will be located in a reentrant well located 3.9 m from TCC. Data from GCD-3 will inform the design of a heavily-shielded "Super" GCD to be located as close as 20 cm from TCC. It will also provide a test-bed for faster optical detectors, potentially lowering the temporal resolution from the current ∼100 ps state-of-the-art photomultiplier tubes (PMT) to ∼10 ps Pulse Dilation PMT technology currently under development.
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Affiliation(s)
- H W Herrmann
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Y H Kim
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - A M McEvoy
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - A B Zylstra
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - C S Young
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - F E Lopez
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - J R Griego
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - V E Fatherley
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - J A Oertel
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - W Stoeffl
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - H Khater
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J E Hernandez
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Carpenter
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M S Rubery
- Atomic Weapons Establishment, Aldermaston, Berkshire RG7 4PR, United Kingdom
| | - C J Horsfield
- Atomic Weapons Establishment, Aldermaston, Berkshire RG7 4PR, United Kingdom
| | - S Gales
- Atomic Weapons Establishment, Aldermaston, Berkshire RG7 4PR, United Kingdom
| | - A Leatherland
- Atomic Weapons Establishment, Aldermaston, Berkshire RG7 4PR, United Kingdom
| | - T Hilsabeck
- General Atomics, San Diego, California 92186, USA
| | - J D Kilkenny
- General Atomics, San Diego, California 92186, USA
| | - R M Malone
- National Security Technologies, LLC, Los Alamos, New Mexico 87544, USA
| | - J D Hares
- Kentech Instruments LTD, Wallingford, United Kingdom
| | - J Milnes
- Photeck LTD, St Leonards on Sea, United Kingdom
| | - W T Shmayda
- Laboratory for Laser Energetics, Rochester, New York 14623, USA
| | - C Stoeckl
- Laboratory for Laser Energetics, Rochester, New York 14623, USA
| | - S H Batha
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
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22
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Hill KW, Bitter M, Delgado-Aparicio L, Efthimion PC, Ellis R, Gao L, Maddox J, Pablant NA, Schneider MB, Chen H, Ayers S, Kauffman RL, MacPhee AG, Beiersdorfer P, Bettencourt R, Ma T, Nora RC, Scott HA, Thorn DB, Kilkenny JD, Nelson D, Shoup M, Maron Y. Development of a high resolution x-ray spectrometer for the National Ignition Facility (NIF). Rev Sci Instrum 2016; 87:11E344. [PMID: 27910374 DOI: 10.1063/1.4962053] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A high resolution (E/ΔE = 1200-1800) Bragg crystal x-ray spectrometer is being developed to measure plasma parameters in National Ignition Facility experiments. The instrument will be a diagnostic instrument manipulator positioned cassette designed mainly to infer electron density in compressed capsules from Stark broadening of the helium-β (1s2-1s3p) lines of krypton and electron temperature from the relative intensities of dielectronic satellites. Two conically shaped crystals will diffract and focus (1) the Kr Heβ complex and (2) the Heα (1s2-1s2p) and Lyα (1s-2p) complexes onto a streak camera photocathode for time resolved measurement, and a third cylindrical or conical crystal will focus the full Heα to Heβ spectral range onto an image plate to provide a time integrated calibration spectrum. Calculations of source x-ray intensity, spectrometer throughput, and spectral resolution are presented. Details of the conical-crystal focusing properties as well as the status of the instrumental design are also presented.
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Affiliation(s)
- K W Hill
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA
| | - M Bitter
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA
| | | | - P C Efthimion
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA
| | - R Ellis
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA
| | - L Gao
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA
| | - J Maddox
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA
| | - N A Pablant
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA
| | - M B Schneider
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - H Chen
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - S Ayers
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - R L Kauffman
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - A G MacPhee
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - P Beiersdorfer
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - R Bettencourt
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - T Ma
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - R C Nora
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - H A Scott
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - D B Thorn
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - J D Kilkenny
- General Atomics, San Diego, California 92121, USA
| | - D Nelson
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - M Shoup
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - Y Maron
- Weizmann Institute of Science, Rehovot 76100, Israel
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23
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Chen H, Palmer N, Dayton M, Carpenter A, Schneider MB, Bell PM, Bradley DK, Claus LD, Fang L, Hilsabeck T, Hohenberger M, Jones OS, Kilkenny JD, Kimmel MW, Robertson G, Rochau G, Sanchez MO, Stahoviak JW, Trotter DC, Porter JL. A high-speed two-frame, 1-2 ns gated X-ray CMOS imager used as a hohlraum diagnostic on the National Ignition Facility (invited). Rev Sci Instrum 2016; 87:11E203. [PMID: 27910306 DOI: 10.1063/1.4962252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A novel x-ray imager, which takes time-resolved gated images along a single line-of-sight, has been successfully implemented at the National Ignition Facility (NIF). This Gated Laser Entrance Hole diagnostic, G-LEH, incorporates a high-speed multi-frame CMOS x-ray imager developed by Sandia National Laboratories to upgrade the existing Static X-ray Imager diagnostic at NIF. The new diagnostic is capable of capturing two laser-entrance-hole images per shot on its 1024 × 448 pixels photo-detector array, with integration times as short as 1.6 ns per frame. Since its implementation on NIF, the G-LEH diagnostic has successfully acquired images from various experimental campaigns, providing critical new information for understanding the hohlraum performance in inertial confinement fusion (ICF) experiments, such as the size of the laser entrance hole vs. time, the growth of the laser-heated gold plasma bubble, the change in brightness of inner beam spots due to time-varying cross beam energy transfer, and plasma instability growth near the hohlraum wall.
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Affiliation(s)
- Hui Chen
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - N Palmer
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M Dayton
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Carpenter
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M B Schneider
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - P M Bell
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D K Bradley
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - L D Claus
- Sandia National Laboratories, Albuquerque, New Mexico 87123, USA
| | - L Fang
- Sandia National Laboratories, Albuquerque, New Mexico 87123, USA
| | - T Hilsabeck
- General Atomics, San Diego, California 92186, USA
| | - M Hohenberger
- Laboratory for Laser Energetics, Rochester, New York 14623, USA
| | - O S Jones
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J D Kilkenny
- General Atomics, San Diego, California 92186, USA
| | - M W Kimmel
- Sandia National Laboratories, Albuquerque, New Mexico 87123, USA
| | - G Robertson
- Sandia National Laboratories, Albuquerque, New Mexico 87123, USA
| | - G Rochau
- Sandia National Laboratories, Albuquerque, New Mexico 87123, USA
| | - M O Sanchez
- Sandia National Laboratories, Albuquerque, New Mexico 87123, USA
| | - J W Stahoviak
- Sandia National Laboratories, Albuquerque, New Mexico 87123, USA
| | - D C Trotter
- Sandia National Laboratories, Albuquerque, New Mexico 87123, USA
| | - J L Porter
- Sandia National Laboratories, Albuquerque, New Mexico 87123, USA
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24
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Gatu Johnson M, Frenje JA, Bionta RM, Casey DT, Eckart MJ, Farrell MP, Grim GP, Hartouni EP, Hatarik R, Hoppe M, Kilkenny JD, Li CK, Petrasso RD, Reynolds HG, Sayre DB, Schoff ME, Séguin FH, Skulina K, Yeamans CB. High-resolution measurements of the DT neutron spectrum using new CD foils in the Magnetic Recoil neutron Spectrometer (MRS) on the National Ignition Facility. Rev Sci Instrum 2016; 87:11D816. [PMID: 27910455 DOI: 10.1063/1.4959946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The Magnetic Recoil neutron Spectrometer (MRS) on the National Ignition Facility measures the DT neutron spectrum from cryogenically layered inertial confinement fusion implosions. Yield, areal density, apparent ion temperature, and directional fluid flow are inferred from the MRS data. This paper describes recent advances in MRS measurements of the primary peak using new, thinner, reduced-area deuterated plastic (CD) conversion foils. The new foils allow operation of MRS at yields 2 orders of magnitude higher than previously possible, at a resolution down to ∼200 keV FWHM.
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Affiliation(s)
- M Gatu Johnson
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - J A Frenje
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - R M Bionta
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D T Casey
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M J Eckart
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M P Farrell
- General Atomics, San Diego, California 92186, USA
| | - G P Grim
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - E P Hartouni
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Hatarik
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M Hoppe
- General Atomics, San Diego, California 92186, USA
| | - J D Kilkenny
- General Atomics, San Diego, California 92186, USA
| | - C K Li
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - R D Petrasso
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - H G Reynolds
- General Atomics, San Diego, California 92186, USA
| | - D B Sayre
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M E Schoff
- General Atomics, San Diego, California 92186, USA
| | - F H Séguin
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - K Skulina
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C B Yeamans
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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25
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Gatu Johnson M, Knauer JP, Cerjan CJ, Eckart MJ, Grim GP, Hartouni EP, Hatarik R, Kilkenny JD, Munro DH, Sayre DB, Spears BK, Bionta RM, Bond EJ, Caggiano JA, Callahan D, Casey DT, Döppner T, Frenje JA, Glebov VY, Hurricane O, Kritcher A, LePape S, Ma T, Mackinnon A, Meezan N, Patel P, Petrasso RD, Ralph JE, Springer PT, Yeamans CB. Indications of flow near maximum compression in layered deuterium-tritium implosions at the National Ignition Facility. Phys Rev E 2016; 94:021202. [PMID: 27627237 DOI: 10.1103/physreve.94.021202] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Indexed: 06/06/2023]
Abstract
An accurate understanding of burn dynamics in implosions of cryogenically layered deuterium (D) and tritium (T) filled capsules, obtained partly through precision diagnosis of these experiments, is essential for assessing the impediments to achieving ignition at the National Ignition Facility. We present measurements of neutrons from such implosions. The apparent ion temperatures T_{ion} are inferred from the variance of the primary neutron spectrum. Consistently higher DT than DD T_{ion} are observed and the difference is seen to increase with increasing apparent DT T_{ion}. The line-of-sight rms variations of both DD and DT T_{ion} are small, ∼150eV, indicating an isotropic source. The DD neutron yields are consistently high relative to the DT neutron yields given the observed T_{ion}. Spatial and temporal variations of the DT temperature and density, DD-DT differential attenuation in the surrounding DT fuel, and fluid motion variations contribute to a DT T_{ion} greater than the DD T_{ion}, but are in a one-dimensional model insufficient to explain the data. We hypothesize that in a three-dimensional interpretation, these effects combined could explain the results.
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Affiliation(s)
- M Gatu Johnson
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - J P Knauer
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - C J Cerjan
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M J Eckart
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - G P Grim
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - E P Hartouni
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Hatarik
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J D Kilkenny
- General Atomics, San Diego, California 92186, USA
| | - D H Munro
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D B Sayre
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B K Spears
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R M Bionta
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - E J Bond
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J A Caggiano
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D Callahan
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D T Casey
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - T Döppner
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J A Frenje
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - V Yu Glebov
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - O Hurricane
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Kritcher
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S LePape
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - T Ma
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Mackinnon
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - N Meezan
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - P Patel
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R D Petrasso
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - J E Ralph
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - P T Springer
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C B Yeamans
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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Hares JD, Dymoke-Bradshaw AKL, Hilsabeck TJ, Kilkenny JD, Morris D, Horsfield CJ, Gales SG, Milnes J, Herrmann HW, McFee C. A demonstration of ultra-high time resolution with a pulse-dilation photo-multiplier. ACTA ACUST UNITED AC 2016. [DOI: 10.1088/1742-6596/717/1/012093] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Kilkenny JD, Caggiano JA, Hatarik R, Knauer JP, Sayre DB, Spears BK, Weber SV, Yeamans CB, Cerjan CJ, Divol L, Eckart MJ, Glebov VY, Herrmann HW, Pape SL, Munro DH, Grim GP, Jones OS, Berzak-Hopkins L, Gatu-Johnson M, Mackinnon AJ, Meezan NB, Casey DT, Frenje JA, Mcnaney JM, Petrasso R, Rinderknecht H, Stoeffl W, Zylstra AB. Understanding the stagnation and burn of implosions on NIF. ACTA ACUST UNITED AC 2016. [DOI: 10.1088/1742-6596/688/1/012048] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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28
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Ma T, Hurricane OA, Callahan DA, Barrios MA, Casey DT, Dewald EL, Dittrich TR, Döppner T, Haan SW, Hinkel DE, Berzak Hopkins LF, Le Pape S, MacPhee AG, Pak A, Park HS, Patel PK, Remington BA, Robey HF, Salmonson JD, Springer PT, Tommasini R, Benedetti LR, Bionta R, Bond E, Bradley DK, Caggiano J, Celliers P, Cerjan CJ, Church JA, Dixit S, Dylla-Spears R, Edgell D, Edwards MJ, Field J, Fittinghoff DN, Frenje JA, Gatu Johnson M, Grim G, Guler N, Hatarik R, Herrmann HW, Hsing WW, Izumi N, Jones OS, Khan SF, Kilkenny JD, Knauer J, Kohut T, Kozioziemski B, Kritcher A, Kyrala G, Landen OL, MacGowan BJ, Mackinnon AJ, Meezan NB, Merrill FE, Moody JD, Nagel SR, Nikroo A, Parham T, Ralph JE, Rosen MD, Rygg JR, Sater J, Sayre D, Schneider MB, Shaughnessy D, Spears BK, Town RPJ, Volegov PL, Wan A, Widmann K, Wilde CH, Yeamans C. Thin shell, high velocity inertial confinement fusion implosions on the national ignition facility. Phys Rev Lett 2015; 114:145004. [PMID: 25910132 DOI: 10.1103/physrevlett.114.145004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Indexed: 06/04/2023]
Abstract
Experiments have recently been conducted at the National Ignition Facility utilizing inertial confinement fusion capsule ablators that are 175 and 165 μm in thickness, 10% and 15% thinner, respectively, than the nominal thickness capsule used throughout the high foot and most of the National Ignition Campaign. These three-shock, high-adiabat, high-foot implosions have demonstrated good performance, with higher velocity and better symmetry control at lower laser powers and energies than their nominal thickness ablator counterparts. Little to no hydrodynamic mix into the DT hot spot has been observed despite the higher velocities and reduced depth for possible instability feedthrough. Early results have shown good repeatability, with up to 1/2 the neutron yield coming from α-particle self-heating.
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Affiliation(s)
- T Ma
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - O A Hurricane
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D A Callahan
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M A Barrios
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D T Casey
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - E L Dewald
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - T R Dittrich
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - T Döppner
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S W Haan
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D E Hinkel
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - L F Berzak Hopkins
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S Le Pape
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A G MacPhee
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Pak
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - H-S Park
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - P K Patel
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B A Remington
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - H F Robey
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J D Salmonson
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - P T Springer
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Tommasini
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - L R Benedetti
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Bionta
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - E Bond
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D K Bradley
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J Caggiano
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - P Celliers
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C J Cerjan
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J A Church
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S Dixit
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Dylla-Spears
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D Edgell
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - M J Edwards
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J Field
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D N Fittinghoff
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J A Frenje
- Massachusetts Institute of Technology Plasma Science and Fusion Center, Cambridge, Massachusetts 02139, USA
| | - M Gatu Johnson
- Massachusetts Institute of Technology Plasma Science and Fusion Center, Cambridge, Massachusetts 02139, USA
| | - G Grim
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - N Guler
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - R Hatarik
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - H W Herrmann
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - W W Hsing
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - N Izumi
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - O S Jones
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S F Khan
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J D Kilkenny
- General Atomics, San Diego, California 92186, USA
| | - J Knauer
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - T Kohut
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B Kozioziemski
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Kritcher
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - G Kyrala
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - O L Landen
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B J MacGowan
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A J Mackinnon
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - N B Meezan
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - F E Merrill
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - J D Moody
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S R Nagel
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Nikroo
- General Atomics, San Diego, California 92186, USA
| | - T Parham
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J E Ralph
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M D Rosen
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J R Rygg
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J Sater
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D Sayre
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M B Schneider
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D Shaughnessy
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B K Spears
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R P J Town
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - P L Volegov
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - A Wan
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - K Widmann
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C H Wilde
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - C Yeamans
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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Izumi N, Hall GN, Carpenter AC, Allen FV, Cruz JG, Felker B, Hargrove D, Holder J, Kilkenny JD, Lumbard A, Montesanti R, Palmer NE, Piston K, Stone G, Thao M, Vern R, Zacharias R, Landen OL, Tommasini R, Bradley DK, Bell PM. Development of a dual MCP framing camera for high energy x-rays. Rev Sci Instrum 2014; 85:11D623. [PMID: 25430199 DOI: 10.1063/1.4891712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Recently developed diagnostic techniques at LLNL require recording backlit images of extremely dense imploded plasmas using hard x-rays, and demand the detector to be sensitive to photons with energies higher than 50 keV [R. Tommasini et al., Phys. Phys. Plasmas 18, 056309 (2011); G. N. Hall et al., "AXIS: An instrument for imaging Compton radiographs using ARC on the NIF," Rev. Sci. Instrum. (these proceedings)]. To increase the sensitivity in the high energy region, we propose to use a combination of two MCPs. The first MCP is operated in a low gain regime and works as a thick photocathode, and the second MCP works as a high gain electron multiplier. We tested the concept of this dual MCP configuration and succeeded in obtaining a detective quantum efficiency of 4.5% for 59 keV x-rays, 3 times larger than with a single plate of the thickness typically used in NIF framing cameras.
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Affiliation(s)
- N Izumi
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - G N Hall
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A C Carpenter
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - F V Allen
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J G Cruz
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B Felker
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D Hargrove
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J Holder
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J D Kilkenny
- General Atomics, San Diego, California 92121, USA
| | - A Lumbard
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Montesanti
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - N E Palmer
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - K Piston
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - G Stone
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M Thao
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Vern
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Zacharias
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - O L Landen
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Tommasini
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D K Bradley
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - P M Bell
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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Nagel SR, Hilsabeck TJ, Bell PM, Bradley DK, Ayers MJ, Piston K, Felker B, Kilkenny JD, Chung T, Sammuli B, Hares JD, Dymoke-Bradshaw AKL. Investigating high speed phenomena in laser plasma interactions using dilation x-ray imager (invited). Rev Sci Instrum 2014; 85:11E504. [PMID: 25430346 DOI: 10.1063/1.4890396] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The DIlation X-ray Imager (DIXI) is a new, high-speed x-ray framing camera at the National Ignition Facility (NIF) sensitive to x-rays in the range of ≈2-17 keV. DIXI uses the pulse-dilation technique to achieve a temporal resolution of less than 10 ps, a ≈10× improvement over conventional framing cameras currently employed on the NIF (≈100 ps resolution), and otherwise only attainable with 1D streaked imaging. The pulse-dilation technique utilizes a voltage ramp to impart a velocity gradient on the signal-bearing electrons. The temporal response, spatial resolution, and x-ray sensitivity of DIXI are characterized with a short x-ray impulse generated using the COMET laser facility at Lawrence Livermore National Laboratory. At the NIF a pinhole array at 10 cm from target chamber center (tcc) projects images onto the photocathode situated outside the NIF chamber wall with a magnification of ≈64×. DIXI will provide important capabilities for warm-dense-matter physics, high-energy-density science, and inertial confinement fusion, adding important capabilities to temporally resolve hot-spot formation, x-ray emission, fuel motion, and mix levels in the hot-spot at neutron yields of up to 10(17). We present characterization data as well as first results on electron-transport phenomena in buried-layer foil experiments.
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Affiliation(s)
- S R Nagel
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - T J Hilsabeck
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA
| | - P M Bell
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - D K Bradley
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - M J Ayers
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - K Piston
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - B Felker
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - J D Kilkenny
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA
| | - T Chung
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA
| | - B Sammuli
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA
| | - J D Hares
- Kentech Instruments Ltd., Wallingford, Oxfordshire OX10, United Kingdom
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31
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Gatu Johnson M, Frenje JA, Li CK, Séguin FH, Petrasso RD, Bionta RM, Casey DT, Caggiano JA, Hatarik R, Khater HY, Sayre DB, Knauer JP, Sangster TC, Herrmann HW, Kilkenny JD. Measurements of fuel and ablator ρR in Symmetry-Capsule implosions with the Magnetic Recoil neutron Spectrometer (MRS) on the National Ignition Facility. Rev Sci Instrum 2014; 85:11E104. [PMID: 25430283 DOI: 10.1063/1.4886418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The Magnetic Recoil neutron Spectrometer (MRS) on the National Ignition Facility (NIF) measures the neutron spectrum in the energy range of 4-20 MeV. This paper describes MRS measurements of DT-fuel and CH-ablator ρR in DT gas-filled symmetry-capsule implosions at the NIF. DT-fuel ρR's of 80-140 mg/cm(2) and CH-ablator ρR's of 400-680 mg/cm(2) are inferred from MRS data. The measurements were facilitated by an improved correction of neutron-induced background in the low-energy part of the MRS spectrum. This work demonstrates the accurate utilization of the complete MRS-measured neutron spectrum for diagnosing NIF DT implosions.
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Affiliation(s)
- M Gatu Johnson
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - J A Frenje
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - C K Li
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - F H Séguin
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - R D Petrasso
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - R M Bionta
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D T Casey
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J A Caggiano
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Hatarik
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - H Y Khater
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D B Sayre
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J P Knauer
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - T C Sangster
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - H W Herrmann
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - J D Kilkenny
- General Atomics, San Diego, California 92186, USA
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32
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Rosenberg MJ, Zylstra AB, Frenje JA, Rinderknecht HG, Johnson MG, Waugh CJ, Séguin FH, Sio H, Sinenian N, Li CK, Petrasso RD, Glebov VY, Hohenberger M, Stoeckl C, Sangster TC, Yeamans CB, LePape S, Mackinnon AJ, Bionta RM, Talison B, Casey DT, Landen OL, Moran MJ, Zacharias RA, Kilkenny JD, Nikroo A. A compact proton spectrometer for measurement of the absolute DD proton spectrum from which yield and ρR are determined in thin-shell inertial-confinement-fusion implosions. Rev Sci Instrum 2014; 85:103504. [PMID: 25362390 DOI: 10.1063/1.4897193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2014] [Accepted: 09/22/2014] [Indexed: 06/04/2023]
Abstract
A compact, step range filter proton spectrometer has been developed for the measurement of the absolute DD proton spectrum, from which yield and areal density (ρR) are inferred for deuterium-filled thin-shell inertial confinement fusion implosions. This spectrometer, which is based on tantalum step-range filters, is sensitive to protons in the energy range 1-9 MeV and can be used to measure proton spectra at mean energies of ∼1-3 MeV. It has been developed and implemented using a linear accelerator and applied to experiments at the OMEGA laser facility and the National Ignition Facility (NIF). Modeling of the proton slowing in the filters is necessary to construct the spectrum, and the yield and energy uncertainties are ±<10% in yield and ±120 keV, respectively. This spectrometer can be used for in situ calibration of DD-neutron yield diagnostics at the NIF.
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Affiliation(s)
- M J Rosenberg
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - A B Zylstra
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - J A Frenje
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - H G Rinderknecht
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - M Gatu Johnson
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - C J Waugh
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - F H Séguin
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - H Sio
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - N Sinenian
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - C K Li
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - R D Petrasso
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - V Yu Glebov
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - M Hohenberger
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - C Stoeckl
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - T C Sangster
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - C B Yeamans
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S LePape
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A J Mackinnon
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R M Bionta
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B Talison
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D T Casey
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - O L Landen
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M J Moran
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R A Zacharias
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J D Kilkenny
- General Atomics, San Diego, California 92186, USA
| | - A Nikroo
- General Atomics, San Diego, California 92186, USA
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33
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Le Pape S, Divol L, Berzak Hopkins L, Mackinnon A, Meezan NB, Casey D, Frenje J, Herrmann H, McNaney J, Ma T, Widmann K, Pak A, Grimm G, Knauer J, Petrasso R, Zylstra A, Rinderknecht H, Rosenberg M, Gatu-Johnson M, Kilkenny JD. Observation of a reflected shock in an indirectly driven spherical implosion at the national ignition facility. Phys Rev Lett 2014; 112:225002. [PMID: 24949774 DOI: 10.1103/physrevlett.112.225002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2013] [Indexed: 06/03/2023]
Abstract
A 200 μm radius hot spot at more than 2 keV temperature, 1 g/cm^{3} density has been achieved on the National Ignition Facility using a near vacuum hohlraum. The implosion exhibits ideal one-dimensional behavior and 99% laser-to-hohlraum coupling. The low opacity of the remaining shell at bang time allows for a measurement of the x-ray emission of the reflected central shock in a deuterium plasma. Comparison with 1D hydrodynamic simulations puts constraints on electron-ion collisions and heat conduction. Results are consistent with classical (Spitzer-Harm) heat flux.
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Affiliation(s)
- S Le Pape
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - L Divol
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - L Berzak Hopkins
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Mackinnon
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - N B Meezan
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D Casey
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J Frenje
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - H Herrmann
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - J McNaney
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - T Ma
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - K Widmann
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Pak
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - G Grimm
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - J Knauer
- Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623, USA
| | - R Petrasso
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - A Zylstra
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - H Rinderknecht
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - M Rosenberg
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - M Gatu-Johnson
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - J D Kilkenny
- General Atomics Corporation, La Jolla, California 92121, USA
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Smalyuk VA, Casey DT, Clark DS, Edwards MJ, Haan SW, Hamza A, Hoover DE, Hsing WW, Hurricane O, Kilkenny JD, Kroll J, Landen OL, Moore A, Nikroo A, Peterson L, Raman K, Remington BA, Robey HF, Weber SV, Widmann K. First measurements of hydrodynamic instability growth in indirectly driven implosions at ignition-relevant conditions on the National Ignition Facility. Phys Rev Lett 2014; 112:185003. [PMID: 24856703 DOI: 10.1103/physrevlett.112.185003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2013] [Indexed: 06/03/2023]
Abstract
Ignition experiments have shown an anomalous susceptibility to hydrodynamic instability growth. To help understand these results, the first hydrodynamic instability growth measurements in indirectly driven implosions on the National Ignition Facility were performed at ignition conditions with peak radiation temperatures up to ∼300 eV. Plastic capsules with two-dimensional preimposed, sinusoidal outer surface modulations of initial wavelengths of 240 (corresponding to a Legendre mode number of 30), 120 (mode 60), and 80 μm (mode 90) were imploded by using actual low-adiabat ignition laser pulses. The measured growth was in excellent agreement, validating 2D hydra simulations for the most dangerous modes in the acceleration phase. These results reinforce confidence in the predictive capability of calculations that are paramount to illuminating the path toward ignition.
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Affiliation(s)
- V A Smalyuk
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D T Casey
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D S Clark
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M J Edwards
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S W Haan
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Hamza
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D E Hoover
- General Atomics, San Diego, California 92121, USA
| | - W W Hsing
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - O Hurricane
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J D Kilkenny
- General Atomics, San Diego, California 92121, USA
| | - J Kroll
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - O L Landen
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Moore
- AWE Aldermaston, Reading, Berkshire RG7 4PR, United Kingdom
| | - A Nikroo
- General Atomics, San Diego, California 92121, USA
| | - L Peterson
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - K Raman
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B A Remington
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - H F Robey
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S V Weber
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - K Widmann
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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35
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Rosenberg MJ, Séguin FH, Waugh CJ, Rinderknecht HG, Orozco D, Frenje JA, Johnson MG, Sio H, Zylstra AB, Sinenian N, Li CK, Petrasso RD, Glebov VY, Stoeckl C, Hohenberger M, Sangster TC, LePape S, Mackinnon AJ, Bionta RM, Landen OL, Zacharias RA, Kim Y, Herrmann HW, Kilkenny JD. Empirical assessment of the detection efficiency of CR-39 at high proton fluence and a compact, proton detector for high-fluence applications. Rev Sci Instrum 2014; 85:043302. [PMID: 24784597 DOI: 10.1063/1.4870898] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
CR-39 solid-state nuclear track detectors are widely used in physics and in many inertial confinement fusion (ICF) experiments, and under ideal conditions these detectors have 100% detection efficiency for ∼0.5-8 MeV protons. When the fluence of incident particles becomes too high, overlap of particle tracks leads to under-counting at typical processing conditions (5 h etch in 6N NaOH at 80 °C). Short etch times required to avoid overlap can cause under-counting as well, as tracks are not fully developed. Experiments have determined the minimum etch times for 100% detection of 1.7-4.3-MeV protons and established that for 2.4-MeV protons, relevant for detection of DD protons, the maximum fluence that can be detected using normal processing techniques is ≲3 × 10(6) cm(-2). A CR-39-based proton detector has been developed to mitigate issues related to high particle fluences on ICF facilities. Using a pinhole and scattering foil several mm in front of the CR-39, proton fluences at the CR-39 are reduced by more than a factor of ∼50, increasing the operating yield upper limit by a comparable amount.
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Affiliation(s)
- M J Rosenberg
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - F H Séguin
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - C J Waugh
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - H G Rinderknecht
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - D Orozco
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - J A Frenje
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - M Gatu Johnson
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - H Sio
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - A B Zylstra
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - N Sinenian
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - C K Li
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - R D Petrasso
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - V Yu Glebov
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - C Stoeckl
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - M Hohenberger
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - T C Sangster
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - S LePape
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A J Mackinnon
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R M Bionta
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - O L Landen
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R A Zacharias
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - Y Kim
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - H W Herrmann
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - J D Kilkenny
- General Atomics, San Diego, California 92186, USA
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36
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Smalyuk VA, Tipton RE, Pino JE, Casey DT, Grim GP, Remington BA, Rowley DP, Weber SV, Barrios M, Benedetti LR, Bleuel DL, Bradley DK, Caggiano JA, Callahan DA, Cerjan CJ, Clark DS, Edgell DH, Edwards MJ, Frenje JA, Gatu-Johnson M, Glebov VY, Glenn S, Haan SW, Hamza A, Hatarik R, Hsing WW, Izumi N, Khan S, Kilkenny JD, Kline J, Knauer J, Landen OL, Ma T, McNaney JM, Mintz M, Moore A, Nikroo A, Pak A, Parham T, Petrasso R, Sayre DB, Schneider MB, Tommasini R, Town RP, Widmann K, Wilson DC, Yeamans CB. Measurements of an ablator-gas atomic mix in indirectly driven implosions at the National Ignition Facility. Phys Rev Lett 2014; 112:025002. [PMID: 24484021 DOI: 10.1103/physrevlett.112.025002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2013] [Indexed: 06/03/2023]
Abstract
We present the first results from an experimental campaign to measure the atomic ablator-gas mix in the deceleration phase of gas-filled capsule implosions on the National Ignition Facility. Plastic capsules containing CD layers were filled with tritium gas; as the reactants are initially separated, DT fusion yield provides a direct measure of the atomic mix of ablator into the hot spot gas. Capsules were imploded with x rays generated in hohlraums with peak radiation temperatures of ∼294 eV. While the TT fusion reaction probes conditions in the central part (core) of the implosion hot spot, the DT reaction probes a mixed region on the outer part of the hot spot near the ablator-hot-spot interface. Experimental data were used to develop and validate the atomic-mix model used in two-dimensional simulations.
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Affiliation(s)
- V A Smalyuk
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R E Tipton
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J E Pino
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D T Casey
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - G P Grim
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - B A Remington
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D P Rowley
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S V Weber
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M Barrios
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - L R Benedetti
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D L Bleuel
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D K Bradley
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J A Caggiano
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D A Callahan
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C J Cerjan
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D S Clark
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D H Edgell
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - M J Edwards
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J A Frenje
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - M Gatu-Johnson
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - V Y Glebov
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - S Glenn
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S W Haan
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Hamza
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Hatarik
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - W W Hsing
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - N Izumi
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S Khan
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J D Kilkenny
- General Atomics, San Diego, California 92121, USA
| | - J Kline
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - J Knauer
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - O L Landen
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - T Ma
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J M McNaney
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M Mintz
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Moore
- AWE Aldermaston, Reading, Berkshire, RG7 4PR, United Kingdom
| | - A Nikroo
- General Atomics, San Diego, California 92121, USA
| | - A Pak
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - T Parham
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Petrasso
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - D B Sayre
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M B Schneider
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Tommasini
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R P Town
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - K Widmann
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D C Wilson
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - C B Yeamans
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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37
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Dewald EL, Milovich JL, Michel P, Landen OL, Kline JL, Glenn S, Jones O, Kalantar DH, Pak A, Robey HF, Kyrala GA, Divol L, Benedetti LR, Holder J, Widmann K, Moore A, Schneider MB, Döppner T, Tommasini R, Bradley DK, Bell P, Ehrlich B, Thomas CA, Shaw M, Widmayer C, Callahan DA, Meezan NB, Town RPJ, Hamza A, Dzenitis B, Nikroo A, Moreno K, Van Wonterghem B, Mackinnon AJ, Glenzer SH, MacGowan BJ, Kilkenny JD, Edwards MJ, Atherton LJ, Moses EI. Early-time symmetry tuning in the presence of cross-beam energy transfer in ICF experiments on the National Ignition Facility. Phys Rev Lett 2013; 111:235001. [PMID: 24476279 DOI: 10.1103/physrevlett.111.235001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2013] [Indexed: 06/03/2023]
Abstract
On the National Ignition Facility, the hohlraum-driven implosion symmetry is tuned using cross-beam energy transfer (CBET) during peak power, which is controlled by applying a wavelength separation between cones of laser beams. In this Letter, we present early-time measurements of the instantaneous soft x-ray drive at the capsule using reemission spheres, which show that this wavelength separation also leads to significant CBET during the first shock, even though the laser intensities are 30× smaller than during the peak. We demonstrate that the resulting early drive P2/P0 asymmetry can be minimized and tuned to <1% accuracy (well within the ±7.5% requirement for ignition) by varying the relative input powers between different cones of beams. These experiments also provide time-resolved measurements of CBET during the first 2 ns of the laser drive, which are in good agreement with radiation-hydrodynamics calculations including a linear CBET model.
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Affiliation(s)
- E L Dewald
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - J L Milovich
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - P Michel
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - O L Landen
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - J L Kline
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - S Glenn
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - O Jones
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - D H Kalantar
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - A Pak
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - H F Robey
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - G A Kyrala
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - L Divol
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - L R Benedetti
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - J Holder
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - K Widmann
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - A Moore
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - M B Schneider
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - T Döppner
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - R Tommasini
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - D K Bradley
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - P Bell
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - B Ehrlich
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - C A Thomas
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - M Shaw
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - C Widmayer
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - D A Callahan
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - N B Meezan
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - R P J Town
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - A Hamza
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - B Dzenitis
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - A Nikroo
- General Atomics, San Diego, California 92186, USA
| | - K Moreno
- General Atomics, San Diego, California 92186, USA
| | - B Van Wonterghem
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - A J Mackinnon
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - S H Glenzer
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - B J MacGowan
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - J D Kilkenny
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - M J Edwards
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - L J Atherton
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
| | - E I Moses
- Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, California 94550, USA
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38
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Smalyuk VA, Atherton LJ, Benedetti LR, Bionta R, Bleuel D, Bond E, Bradley DK, Caggiano J, Callahan DA, Casey DT, Celliers PM, Cerjan CJ, Clark D, Dewald EL, Dixit SN, Döppner T, Edgell DH, Edwards MJ, Frenje J, Gatu-Johnson M, Glebov VY, Glenn S, Glenzer SH, Grim G, Haan SW, Hammel BA, Hartouni EP, Hatarik R, Hatchett S, Hicks DG, Hsing WW, Izumi N, Jones OS, Key MH, Khan SF, Kilkenny JD, Kline JL, Knauer J, Kyrala GA, Landen OL, Le Pape S, Lindl JD, Ma T, MacGowan BJ, Mackinnon AJ, MacPhee AG, McNaney J, Meezan NB, Moody JD, Moore A, Moran M, Moses EI, Pak A, Parham T, Park HS, Patel PK, Petrasso R, Ralph JE, Regan SP, Remington BA, Robey HF, Ross JS, Spears BK, Springer PT, Suter LJ, Tommasini R, Town RP, Weber SV, Widmann K. Performance of high-convergence, layered DT implosions with extended-duration pulses at the National Ignition Facility. Phys Rev Lett 2013; 111:215001. [PMID: 24313493 DOI: 10.1103/physrevlett.111.215001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Indexed: 06/02/2023]
Abstract
Radiation-driven, low-adiabat, cryogenic DT layered plastic capsule implosions were carried out on the National Ignition Facility (NIF) to study the sensitivity of performance to peak power and drive duration. An implosion with extended drive and at reduced peak power of 350 TW achieved the highest compression with fuel areal density of ~1.3±0.1 g/cm2, representing a significant step from previously measured ~1.0 g/cm2 toward a goal of 1.5 g/cm2. Future experiments will focus on understanding and mitigating hydrodynamic instabilities and mix, and improving symmetry required to reach the threshold for thermonuclear ignition on NIF.
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Affiliation(s)
- V A Smalyuk
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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39
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Ma T, Patel PK, Izumi N, Springer PT, Key MH, Atherton LJ, Benedetti LR, Bradley DK, Callahan DA, Celliers PM, Cerjan CJ, Clark DS, Dewald EL, Dixit SN, Döppner T, Edgell DH, Epstein R, Glenn S, Grim G, Haan SW, Hammel BA, Hicks D, Hsing WW, Jones OS, Khan SF, Kilkenny JD, Kline JL, Kyrala GA, Landen OL, Le Pape S, MacGowan BJ, Mackinnon AJ, MacPhee AG, Meezan NB, Moody JD, Pak A, Parham T, Park HS, Ralph JE, Regan SP, Remington BA, Robey HF, Ross JS, Spears BK, Smalyuk V, Suter LJ, Tommasini R, Town RP, Weber SV, Lindl JD, Edwards MJ, Glenzer SH, Moses EI. Onset of hydrodynamic mix in high-velocity, highly compressed inertial confinement fusion implosions. Phys Rev Lett 2013; 111:085004. [PMID: 24010449 DOI: 10.1103/physrevlett.111.085004] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2013] [Indexed: 06/02/2023]
Abstract
Deuterium-tritium inertial confinement fusion implosion experiments on the National Ignition Facility have demonstrated yields ranging from 0.8 to 7×10(14), and record fuel areal densities of 0.7 to 1.3 g/cm2. These implosions use hohlraums irradiated with shaped laser pulses of 1.5-1.9 MJ energy. The laser peak power and duration at peak power were varied, as were the capsule ablator dopant concentrations and shell thicknesses. We quantify the level of hydrodynamic instability mix of the ablator into the hot spot from the measured elevated absolute x-ray emission of the hot spot. We observe that DT neutron yield and ion temperature decrease abruptly as the hot spot mix mass increases above several hundred ng. The comparison with radiation-hydrodynamic modeling indicates that low mode asymmetries and increased ablator surface perturbations may be responsible for the current performance.
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Affiliation(s)
- T Ma
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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40
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Regan SP, Epstein R, Hammel BA, Suter LJ, Scott HA, Barrios MA, Bradley DK, Callahan DA, Cerjan C, Collins GW, Dixit SN, Döppner T, Edwards MJ, Farley DR, Fournier KB, Glenn S, Glenzer SH, Golovkin IE, Haan SW, Hamza A, Hicks DG, Izumi N, Jones OS, Kilkenny JD, Kline JL, Kyrala GA, Landen OL, Ma T, MacFarlane JJ, MacKinnon AJ, Mancini RC, McCrory RL, Meezan NB, Meyerhofer DD, Nikroo A, Park HS, Ralph J, Remington BA, Sangster TC, Smalyuk VA, Springer PT, Town RPJ. Hot-spot mix in ignition-scale inertial confinement fusion targets. Phys Rev Lett 2013; 111:045001. [PMID: 23931375 DOI: 10.1103/physrevlett.111.045001] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2011] [Revised: 04/04/2013] [Indexed: 06/02/2023]
Abstract
Mixing of plastic ablator material, doped with Cu and Ge dopants, deep into the hot spot of ignition-scale inertial confinement fusion implosions by hydrodynamic instabilities is diagnosed with x-ray spectroscopy on the National Ignition Facility. The amount of hot-spot mix mass is determined from the absolute brightness of the emergent Cu and Ge K-shell emission. The Cu and Ge dopants placed at different radial locations in the plastic ablator show the ablation-front hydrodynamic instability is primarily responsible for hot-spot mix. Low neutron yields and hot-spot mix mass between 34(-13,+50) ng and 4000(-2970,+17 160) ng are observed.
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Affiliation(s)
- S P Regan
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
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41
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Gatu Johnson M, Frenje JA, Casey DT, Li CK, Séguin FH, Petrasso R, Ashabranner R, Bionta RM, Bleuel DL, Bond EJ, Caggiano JA, Carpenter A, Cerjan CJ, Clancy TJ, Doeppner T, Eckart MJ, Edwards MJ, Friedrich S, Glenzer SH, Haan SW, Hartouni EP, Hatarik R, Hatchett SP, Jones OS, Kyrala G, Le Pape S, Lerche RA, Landen OL, Ma T, MacKinnon AJ, McKernan MA, Moran MJ, Moses E, Munro DH, McNaney J, Park HS, Ralph J, Remington B, Rygg JR, Sepke SM, Smalyuk V, Spears B, Springer PT, Yeamans CB, Farrell M, Jasion D, Kilkenny JD, Nikroo A, Paguio R, Knauer JP, Glebov VY, Sangster TC, Betti R, Stoeckl C, Magoon J, Shoup MJ, Grim GP, Kline J, Morgan GL, Murphy TJ, Leeper RJ, Ruiz CL, Cooper GW, Nelson AJ. Neutron spectrometry--an essential tool for diagnosing implosions at the National Ignition Facility (invited). Rev Sci Instrum 2012; 83:10D308. [PMID: 23126835 DOI: 10.1063/1.4728095] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
DT neutron yield (Y(n)), ion temperature (T(i)), and down-scatter ratio (dsr) determined from measured neutron spectra are essential metrics for diagnosing the performance of inertial confinement fusion (ICF) implosions at the National Ignition Facility (NIF). A suite of neutron-time-of-flight (nTOF) spectrometers and a magnetic recoil spectrometer (MRS) have been implemented in different locations around the NIF target chamber, providing good implosion coverage and the complementarity required for reliable measurements of Y(n), T(i), and dsr. From the measured dsr value, an areal density (ρR) is determined through the relationship ρR(tot) (g∕cm(2)) = (20.4 ± 0.6) × dsr(10-12 MeV). The proportionality constant is determined considering implosion geometry, neutron attenuation, and energy range used for the dsr measurement. To ensure high accuracy in the measurements, a series of commissioning experiments using exploding pushers have been used for in situ calibration of the as-built spectrometers, which are now performing to the required accuracy. Recent data obtained with the MRS and nTOFs indicate that the implosion performance of cryogenically layered DT implosions, characterized by the experimental ignition threshold factor (ITFx), which is a function of dsr (or fuel ρR) and Y(n), has improved almost two orders of magnitude since the first shot in September, 2010.
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Affiliation(s)
- M Gatu Johnson
- Massachusetts Institute of Technology Plasma Science and Fusion Center, Cambridge, Massachusetts 02139, USA
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42
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Nagel SR, Hilsabeck TJ, Bell PM, Bradley DK, Ayers MJ, Barrios MA, Felker B, Smith RF, Collins GW, Jones OS, Kilkenny JD, Chung T, Piston K, Raman KS, Sammuli B, Hares JD, Dymoke-Bradshaw AKL. Dilation x-ray imager a new∕faster gated x-ray imager for the NIF. Rev Sci Instrum 2012; 83:10E116. [PMID: 23126938 DOI: 10.1063/1.4732849] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
As the yield on implosion shots increases it is expected that the peak x-ray emission reduces to a duration with a FWHM as short as 20 ps for ∼7 × 10(18) neutron yield. However, the temporal resolution of currently used gated x-ray imagers on the NIF is 40-100 ps. We discuss the benefits of the higher temporal resolution for the NIF and present performance measurements for dilation x-ray imager, which utilizes pulse-dilation technology [T. J. Hilsabeck et al., Rev. Sci. Instrum. 81, 10E317 (2010)] to achieve x-ray imaging with temporal gate times below 10 ps. The measurements were conducted using the COMET laser, which is part of the Jupiter Laser Facility at the Lawrence Livermore National Laboratory.
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Affiliation(s)
- S R Nagel
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA.
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43
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Schneider MB, Meezan NB, Alvarez SS, Alameda J, Baker S, Bell PM, Bradley DK, Callahan DA, Celeste JR, Dewald EL, Dixit SN, Döppner T, Eder DC, Edwards MJ, Fernandez-Perea M, Gullikson E, Haugh MJ, Hau-Riege S, Hsing W, Izumi N, Jones OS, Kalantar DH, Kilkenny JD, Kline JL, Kyrala GA, Landen OL, London RA, MacGowan BJ, MacKinnon AJ, McCarville TJ, Milovich JL, Mirkarimi P, Moody JD, Moore AS, Myers MD, Palma EA, Palmer N, Pivovaroff MJ, Ralph JE, Robinson J, Soufli R, Suter LJ, Teruya AT, Thomas CA, Town RP, Vernon SP, Widmann K, Young BK. Soft x-ray images of the laser entrance hole of ignition hohlraums. Rev Sci Instrum 2012; 83:10E525. [PMID: 23127032 DOI: 10.1063/1.4732850] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Hohlraums are employed at the national ignition facility to convert laser energy into a thermal x-radiation drive, which implodes a fusion capsule, thus compressing the fuel. The x-radiation drive is measured with a low spectral resolution, time-resolved x-ray spectrometer, which views the region around the hohlraum's laser entrance hole. This measurement has no spatial resolution. To convert this to the drive inside the hohlraum, the size of the hohlraum's opening ("clear aperture") and fraction of the measured x-radiation, which comes from this opening, must be known. The size of the clear aperture is measured with the time integrated static x-ray imager (SXI). A soft x-ray imaging channel has been added to the SXI to measure the fraction of x-radiation emitted from inside the clear aperture. A multilayer mirror plus filter selects an x-ray band centered at 870 eV, near the peak of the x-ray spectrum of a 300 eV blackbody. Results from this channel and corrections to the x-radiation drive are discussed.
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Affiliation(s)
- M B Schneider
- Lawrence Livermore National Laboratory, Livermore, California 94551-0808, USA.
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44
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Edgell DH, Bradley DK, Bond EJ, Burns S, Callahan DA, Celeste J, Eckart MJ, Glebov VY, Hey DS, Lacaille G, Kilkenny JD, Kimbrough J, Mackinnon AJ, Magoon J, Parker J, Sangster TC, Shoup MJ, Stoeckl C, Thomas T, MacPhee A. South pole bang-time diagnostic on the National Ignition Facility (invited). Rev Sci Instrum 2012; 83:10E119. [PMID: 23126941 DOI: 10.1063/1.4731756] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The south pole bang-time diagnostic views National Ignition Facility (NIF) implosions through the lower Hohlraum laser entrance hole to measure the time of peak x-ray emission (peak compression) in indirect-drive implosions. Five chemical-vapor-deposition diamond photoconductive detectors with different filtrations and sensitivities record the time-varying x rays emitted by the target. Wavelength selecting highly oriented pyrolytic graphite crystal mirror monochromators increase the x-ray signal-to-background ratio by filtering for 11-keV emission. Diagnostic timing and the in situ temporal instrument response function are determined from laser impulse shots on the NIF. After signal deconvolution and background removal, the bang time is determined to 45-ps accuracy. The x-ray "yield" (mJ∕sr∕keV at 11 keV) is determined from the time integral of the corrected peak signal.
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Affiliation(s)
- D H Edgell
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA.
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45
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Mackinnon AJ, Kline JL, Dixit SN, Glenzer SH, Edwards MJ, Callahan DA, Meezan NB, Haan SW, Kilkenny JD, Döppner T, Farley DR, Moody JD, Ralph JE, MacGowan BJ, Landen OL, Robey HF, Boehly TR, Celliers PM, Eggert JH, Krauter K, Frieders G, Ross GF, Hicks DG, Olson RE, Weber SV, Spears BK, Salmonsen JD, Michel P, Divol L, Hammel B, Thomas CA, Clark DS, Jones OS, Springer PT, Cerjan CJ, Collins GW, Glebov VY, Knauer JP, Sangster C, Stoeckl C, McKenty P, McNaney JM, Leeper RJ, Ruiz CL, Cooper GW, Nelson AG, Chandler GGA, Hahn KD, Moran MJ, Schneider MB, Palmer NE, Bionta RM, Hartouni EP, LePape S, Patel PK, Izumi N, Tommasini R, Bond EJ, Caggiano JA, Hatarik R, Grim GP, Merrill FE, Fittinghoff DN, Guler N, Drury O, Wilson DC, Herrmann HW, Stoeffl W, Casey DT, Johnson MG, Frenje JA, Petrasso RD, Zylestra A, Rinderknecht H, Kalantar DH, Dzenitis JM, Di Nicola P, Eder DC, Courdin WH, Gururangan G, Burkhart SC, Friedrich S, Blueuel DL, Bernstein LA, Eckart MJ, Munro DH, Hatchett SP, Macphee AG, Edgell DH, Bradley DK, Bell PM, Glenn SM, Simanovskaia N, Barrios MA, Benedetti R, Kyrala GA, Town RPJ, Dewald EL, Milovich JL, Widmann K, Moore AS, LaCaille G, Regan SP, Suter LJ, Felker B, Ashabranner RC, Jackson MC, Prasad R, Richardson MJ, Kohut TR, Datte PS, Krauter GW, Klingman JJ, Burr RF, Land TA, Hermann MR, Latray DA, Saunders RL, Weaver S, Cohen SJ, Berzins L, Brass SG, Palma ES, Lowe-Webb RR, McHalle GN, Arnold PA, Lagin LJ, Marshall CD, Brunton GK, Mathisen DG, Wood RD, Cox JR, Ehrlich RB, Knittel KM, Bowers MW, Zacharias RA, Young BK, Holder JP, Kimbrough JR, Ma T, La Fortune KN, Widmayer CC, Shaw MJ, Erbert GV, Jancaitis KS, DiNicola JM, Orth C, Heestand G, Kirkwood R, Haynam C, Wegner PJ, Whitman PK, Hamza A, Dzenitis EG, Wallace RJ, Bhandarkar SD, Parham TG, Dylla-Spears R, Mapoles ER, Kozioziemski BJ, Sater JD, Walters CF, Haid BJ, Fair J, Nikroo A, Giraldez E, Moreno K, Vanwonterghem B, Kauffman RL, Batha S, Larson DW, Fortner RJ, Schneider DH, Lindl JD, Patterson RW, Atherton LJ, Moses EI. Assembly of high-areal-density deuterium-tritium fuel from indirectly driven cryogenic implosions. Phys Rev Lett 2012; 108:215005. [PMID: 23003274 DOI: 10.1103/physrevlett.108.215005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2011] [Indexed: 06/01/2023]
Abstract
The National Ignition Facility has been used to compress deuterium-tritium to an average areal density of ~1.0±0.1 g cm(-2), which is 67% of the ignition requirement. These conditions were obtained using 192 laser beams with total energy of 1-1.6 MJ and peak power up to 420 TW to create a hohlraum drive with a shaped power profile, peaking at a soft x-ray radiation temperature of 275-300 eV. This pulse delivered a series of shocks that compressed a capsule containing cryogenic deuterium-tritium to a radius of 25-35 μm. Neutron images of the implosion were used to estimate a fuel density of 500-800 g cm(-3).
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Affiliation(s)
- A J Mackinnon
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
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46
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Döppner T, Thomas CA, Divol L, Dewald EL, Celliers PM, Bradley DK, Callahan DA, Dixit SN, Harte JA, Glenn SM, Haan SW, Izumi N, Kyrala GA, LaCaille G, Kline JK, Kruer WL, Ma T, MacKinnon AJ, McNaney JM, Meezan NB, Robey HF, Salmonson JD, Suter LJ, Zimmerman GB, Edwards MJ, MacGowan BJ, Kilkenny JD, Lindl JD, Van Wonterghem BM, Atherton LJ, Moses EI, Glenzer SH, Landen OL. Direct measurement of energetic electrons coupling to an imploding low-adiabat inertial confinement fusion capsule. Phys Rev Lett 2012; 108:135006. [PMID: 22540711 DOI: 10.1103/physrevlett.108.135006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2011] [Indexed: 05/31/2023]
Abstract
We have imaged hard x-ray (>100 keV) bremsstrahlung emission from energetic electrons slowing in a plastic ablator shell during indirectly driven implosions at the National Ignition Facility. We measure 570 J in electrons with E>100 keV impinging on the fusion capsule under ignition drive conditions. This translates into an acceptable increase in the adiabat α, defined as the ratio of total deuterium-tritium fuel pressure to Fermi pressure, of 3.5%. The hard x-ray observables are consistent with detailed radiative-hydrodynamics simulations, including the sourcing and transport of these high energy electrons.
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Affiliation(s)
- T Döppner
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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47
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Li CK, Séguin FH, Frenje JA, Rosenberg MJ, Rinderknecht HG, Zylstra AB, Petrasso RD, Amendt PA, Landen OL, Mackinnon AJ, Town RPJ, Wilks SC, Betti R, Meyerhofer DD, Soures JM, Hund J, Kilkenny JD, Nikroo A. Impeding hohlraum plasma stagnation in inertial-confinement fusion. Phys Rev Lett 2012; 108:025001. [PMID: 22324691 DOI: 10.1103/physrevlett.108.025001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2010] [Indexed: 05/31/2023]
Abstract
This Letter reports the first time-gated proton radiography of the spatial structure and temporal evolution of how the fill gas compresses the wall blowoff, inhibits plasma jet formation, and impedes plasma stagnation in the hohlraum interior. The potential roles of spontaneously generated electric and magnetic fields in the hohlraum dynamics and capsule implosion are discussed. It is shown that interpenetration of the two materials could result from the classical Rayleigh-Taylor instability occurring as the lighter, decelerating ionized fill gas pushes against the heavier, expanding gold wall blowoff. This experiment showed new observations of the effects of the fill gas on x-ray driven implosions, and an improved understanding of these results could impact the ongoing ignition experiments at the National Ignition Facility.
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Affiliation(s)
- C K Li
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
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48
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Glenzer SH, MacGowan BJ, Meezan NB, Adams PA, Alfonso JB, Alger ET, Alherz Z, Alvarez LF, Alvarez SS, Amick PV, Andersson KS, Andrews SD, Antonini GJ, Arnold PA, Atkinson DP, Auyang L, Azevedo SG, Balaoing BNM, Baltz JA, Barbosa F, Bardsley GW, Barker DA, Barnes AI, Baron A, Beeler RG, Beeman BV, Belk LR, Bell JC, Bell PM, Berger RL, Bergonia MA, Bernardez LJ, Berzins LV, Bettenhausen RC, Bezerides L, Bhandarkar SD, Bishop CL, Bond EJ, Bopp DR, Borgman JA, Bower JR, Bowers GA, Bowers MW, Boyle DT, Bradley DK, Bragg JL, Braucht J, Brinkerhoff DL, Browning DF, Brunton GK, Burkhart SC, Burns SR, Burns KE, Burr B, Burrows LM, Butlin RK, Cahayag NJ, Callahan DA, Cardinale PS, Carey RW, Carlson JW, Casey AD, Castro C, Celeste JR, Chakicherla AY, Chambers FW, Chan C, Chandrasekaran H, Chang C, Chapman RF, Charron K, Chen Y, Christensen MJ, Churby AJ, Clancy TJ, Cline BD, Clowdus LC, Cocherell DG, Coffield FE, Cohen SJ, Costa RL, Cox JR, Curnow GM, Dailey MJ, Danforth PM, Darbee R, Datte PS, Davis JA, Deis GA, Demaret RD, Dewald EL, Di Nicola P, Di Nicola JM, Divol L, Dixit S, Dobson DB, Doppner T, Driscoll JD, Dugorepec J, Duncan JJ, Dupuy PC, Dzenitis EG, Eckart MJ, Edson SL, Edwards GJ, Edwards MJ, Edwards OD, Edwards PW, Ellefson JC, Ellerbee CH, Erbert GV, Estes CM, Fabyan WJ, Fallejo RN, Fedorov M, Felker B, Fink JT, Finney MD, Finnie LF, Fischer MJ, Fisher JM, Fishler BT, Florio JW, Forsman A, Foxworthy CB, Franks RM, Frazier T, Frieder G, Fung T, Gawinski GN, Gibson CR, Giraldez E, Glenn SM, Golick BP, Gonzales H, Gonzales SA, Gonzalez MJ, Griffin KL, Grippen J, Gross SM, Gschweng PH, Gururangan G, Gu K, Haan SW, Hahn SR, Haid BJ, Hamblen JE, Hammel BA, Hamza AV, Hardy DL, Hart DR, Hartley RG, Haynam CA, Heestand GM, Hermann MR, Hermes GL, Hey DS, Hibbard RL, Hicks DG, Hinkel DE, Hipple DL, Hitchcock JD, Hodtwalker DL, Holder JP, Hollis JD, Holtmeier GM, Huber SR, Huey AW, Hulsey DN, Hunter SL, Huppler TR, Hutton MS, Izumi N, Jackson JL, Jackson MA, Jancaitis KS, Jedlovec DR, Johnson B, Johnson MC, Johnson T, Johnston MP, Jones OS, Kalantar DH, Kamperschroer JH, Kauffman RL, Keating GA, Kegelmeyer LM, Kenitzer SL, Kimbrough JR, King K, Kirkwood RK, Klingmann JL, Knittel KM, Kohut TR, Koka KG, Kramer SW, Krammen JE, Krauter KG, Krauter GW, Krieger EK, Kroll JJ, La Fortune KN, Lagin LJ, Lakamsani VK, Landen OL, Lane SW, Langdon AB, Langer SH, Lao N, Larson DW, Latray D, Lau GT, Le Pape S, Lechleiter BL, Lee Y, Lee TL, Li J, Liebman JA, Lindl JD, Locke SF, Loey HK, London RA, Lopez FJ, Lord DM, Lowe-Webb RR, Lown JG, Ludwigsen AP, Lum NW, Lyons RR, Ma T, MacKinnon AJ, Magat MD, Maloy DT, Malsbury TN, Markham G, Marquez RM, Marsh AA, Marshall CD, Marshall SR, Maslennikov IL, Mathisen DG, Mauger GJ, Mauvais MY, McBride JA, McCarville T, McCloud JB, McGrew A, McHale B, MacPhee AG, Meeker JF, Merill JS, Mertens EP, Michel PA, Miller MG, Mills T, Milovich JL, Miramontes R, Montesanti RC, Montoya MM, Moody J, Moody JD, Moreno KA, Morris J, Morriston KM, Nelson JR, Neto M, Neumann JD, Ng E, Ngo QM, Olejniczak BL, Olson RE, Orsi NL, Owens MW, Padilla EH, Pannell TM, Parham TG, Patterson RW, Pavel G, Prasad RR, Pendlton D, Penko FA, Pepmeier BL, Petersen DE, Phillips TW, Pigg D, Piston KW, Pletcher KD, Powell CL, Radousky HB, Raimondi BS, Ralph JE, Rampke RL, Reed RK, Reid WA, Rekow VV, Reynolds JL, Rhodes JJ, Richardson MJ, Rinnert RJ, Riordan BP, Rivenes AS, Rivera AT, Roberts CJ, Robinson JA, Robinson RB, Robison SR, Rodriguez OR, Rogers SP, Rosen MD, Ross GF, Runkel M, Runtal AS, Sacks RA, Sailors SF, Salmon JT, Salmonson JD, Saunders RL, Schaffer JR, Schindler TM, Schmitt MJ, Schneider MB, Segraves KS, Shaw MJ, Sheldrick ME, Shelton RT, Shiflett MK, Shiromizu SJ, Shor M, Silva LL, Silva SA, Skulina KM, Smauley DA, Smith BE, Smith LK, Solomon AL, Sommer S, Soto JG, Spafford NI, Speck DE, Springer PT, Stadermann M, Stanley F, Stone TG, Stout EA, Stratton PL, Strausser RJ, Suter LJ, Sweet W, Swisher MF, Tappero JD, Tassano JB, Taylor JS, Tekle EA, Thai C, Thomas CA, Thomas A, Throop AL, Tietbohl GL, Tillman JM, Town RPJ, Townsend SL, Tribbey KL, Trummer D, Truong J, Vaher J, Valadez M, Van Arsdall P, Van Prooyen AJ, Vergel de Dios EO, Vergino MD, Vernon SP, Vickers JL, Villanueva GT, Vitalich MA, Vonhof SA, Wade FE, Wallace RJ, Warren CT, Warrick AL, Watkins J, Weaver S, Wegner PJ, Weingart MA, Wen J, White KS, Whitman PK, Widmann K, Widmayer CC, Wilhelmsen K, Williams EA, Williams WH, Willis L, Wilson EF, Wilson BA, Witte MC, Work K, Yang PS, Young BK, Youngblood KP, Zacharias RA, Zaleski T, Zapata PG, Zhang H, Zielinski JS, Kline JL, Kyrala GA, Niemann C, Kilkenny JD, Nikroo A, Van Wonterghem BM, Atherton LJ, Moses EI. Demonstration of ignition radiation temperatures in indirect-drive inertial confinement fusion hohlraums. Phys Rev Lett 2011; 106:085004. [PMID: 21405580 DOI: 10.1103/physrevlett.106.085004] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2010] [Indexed: 05/30/2023]
Abstract
We demonstrate the hohlraum radiation temperature and symmetry required for ignition-scale inertial confinement fusion capsule implosions. Cryogenic gas-filled hohlraums with 2.2 mm-diameter capsules are heated with unprecedented laser energies of 1.2 MJ delivered by 192 ultraviolet laser beams on the National Ignition Facility. Laser backscatter measurements show that these hohlraums absorb 87% to 91% of the incident laser power resulting in peak radiation temperatures of T(RAD)=300 eV and a symmetric implosion to a 100 μm diameter hot core.
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Affiliation(s)
- S H Glenzer
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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Glebov VY, Sangster TC, Stoeckl C, Knauer JP, Theobald W, Marshall KL, Shoup MJ, Buczek T, Cruz M, Duffy T, Romanofsky M, Fox M, Pruyne A, Moran MJ, Lerche RA, McNaney J, Kilkenny JD, Eckart MJ, Schneider D, Munro D, Stoeffl W, Zacharias R, Haslam JJ, Clancy T, Yeoman M, Warwas D, Horsfield CJ, Bourgade JL, Landoas O, Disdier L, Chandler GA, Leeper RJ. The National Ignition Facility neutron time-of-flight system and its initial performance (invited). Rev Sci Instrum 2010; 81:10D325. [PMID: 21033848 DOI: 10.1063/1.3492351] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The National Ignition Facility (NIF) successfully completed its first inertial confinement fusion (ICF) campaign in 2009. A neutron time-of-flight (nTOF) system was part of the nuclear diagnostics used in this campaign. The nTOF technique has been used for decades on ICF facilities to infer the ion temperature of hot deuterium (D(2)) and deuterium-tritium (DT) plasmas based on the temporal Doppler broadening of the primary neutron peak. Once calibrated for absolute neutron sensitivity, the nTOF detectors can be used to measure the yield with high accuracy. The NIF nTOF system is designed to measure neutron yield and ion temperature over 11 orders of magnitude (from 10(8) to 10(19)), neutron bang time in DT implosions between 10(12) and 10(16), and to infer areal density for DT yields above 10(12). During the 2009 campaign, the three most sensitive neutron time-of-flight detectors were installed and used to measure the primary neutron yield and ion temperature from 25 high-convergence implosions using D(2) fuel. The OMEGA yield calibration of these detectors was successfully transferred to the NIF.
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Affiliation(s)
- V Yu Glebov
- Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623, USA.
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50
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Park HS, Dewald ED, Glenzer S, Kalantar DH, Kilkenny JD, MacGowan BJ, Maddox BR, Milovich JL, Prasad RR, Remington BA, Robey HF, Thomas CA. Characterizing high energy spectra of NIF ignition Hohlraums using a differentially filtered high energy multipinhole x-ray imager. Rev Sci Instrum 2010; 81:10E519. [PMID: 21034047 DOI: 10.1063/1.3478682] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Understanding hot electron distributions generated inside Hohlraums is important to the national ignition campaign for controlling implosion symmetry and sources of preheat. While direct imaging of hot electrons is difficult, their spatial distribution and spectrum can be deduced by detecting high energy x-rays generated as they interact with target materials. We used an array of 18 pinholes with four independent filter combinations to image entire Hohlraums with a magnification of 0.87× during the Hohlraum energetics campaign on NIF. Comparing our results with Hohlraum simulations indicates that the characteristic 10-40 keV hot electrons are mainly generated from backscattered laser-plasma interactions rather than from Hohlraum hydrodynamics.
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Affiliation(s)
- Hye-Sook Park
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
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