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Rice N, Vu M, Kong C, Mauldin M, Tambazidis A, Hoppe M, Fitzsimmons P, Farrell M, Clark D, Dewald E, Smalyuk V. Capsule Shimming Developments for National Ignition Facility (NIF) Hohlraum Asymmetry Experiments. Fusion Science and Technology 2018. [DOI: 10.1080/15361055.2017.1389603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- N. Rice
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608
| | - M. Vu
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608
| | - C. Kong
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608
| | - M. Mauldin
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608
| | - A. Tambazidis
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608
| | - M. Hoppe
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608
| | - P. Fitzsimmons
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608
| | - M. Farrell
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608
| | - D. Clark
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550
| | - E. Dewald
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550
| | - V. Smalyuk
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550
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Giraldez EM, Hoppe ML, Hoover DE, Nguyen AQL, Rice NG, Garcia AM, Huang H, Mauldin MP, Farrell MP, Nikroo A, Smalyuk V. Machining of Two-Dimensional Sinusoidal Defects on Ignition-Type Capsules to Study Hydrodynamic Instability at the National Ignition Facility. Fusion Science and Technology 2017. [DOI: 10.13182/fst15-234] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [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)
- E. M. Giraldez
- General Atomics, P.O. Box 85608, San Diego, California 92186
| | - M. L. Hoppe
- General Atomics, P.O. Box 85608, San Diego, California 92186
| | - D. E. Hoover
- General Atomics, P.O. Box 85608, San Diego, California 92186
| | - A. Q. L. Nguyen
- General Atomics, P.O. Box 85608, San Diego, California 92186
| | - N. G. Rice
- General Atomics, P.O. Box 85608, San Diego, California 92186
| | - A. M. Garcia
- General Atomics, P.O. Box 85608, San Diego, California 92186
| | - H. Huang
- General Atomics, P.O. Box 85608, San Diego, California 92186
| | - M. P. Mauldin
- General Atomics, P.O. Box 85608, San Diego, California 92186
| | - M. P. Farrell
- General Atomics, P.O. Box 85608, San Diego, California 92186
| | - A. Nikroo
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550
| | - V. Smalyuk
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550
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Pickworth LA, McCarville T, Decker T, Pardini T, Ayers J, Bell P, Bradley D, Brejnholt NF, Izumi N, Mirkarimi P, Pivovaroff M, Smalyuk V, Vogel J, Walton C, Kilkenny J. A Kirkpatrick-Baez microscope for the National Ignition Facility. Rev Sci Instrum 2014; 85:11D611. [PMID: 25430187 DOI: 10.1063/1.4886433] [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: 06/04/2023]
Abstract
Current pinhole x ray imaging at the National Ignition Facility (NIF) is limited in resolution and signal throughput to the detector for Inertial Confinement Fusion applications, due to the viable range of pinhole sizes (10-25 μm) that can be deployed. A higher resolution and throughput diagnostic is in development using a Kirkpatrick-Baez microscope system (KBM). The system will achieve <9 μm resolution over a 300 μm field of view with a multilayer coating operating at 10.2 keV. Presented here are the first images from the uncoated NIF KBM configuration demonstrating high resolution has been achieved across the full 300 μm field of view.
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Affiliation(s)
- L A Pickworth
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - T McCarville
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - T Decker
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - T Pardini
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J Ayers
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - P Bell
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D Bradley
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - N F Brejnholt
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - N Izumi
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - P Mirkarimi
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M Pivovaroff
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - V Smalyuk
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J Vogel
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C Walton
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J Kilkenny
- General Atomics, San Diego, California 92121, USA
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Rousseau A, Darbon S, Troussel P, Caillaud T, Bourgade J, Turk G, Vigne E, Hamel M, Larour J, Bradley D, Smalyuk V, Bell P. Development of a hardened imaging system for the Laser MegaJoule. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20135913006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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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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Gao L, Nilson PM, Igumenschev IV, Fiksel G, Yan R, Davies JR, Martinez D, Smalyuk V, Haines MG, Blackman EG, Froula DH, Betti R, Meyerhofer DD. Observation of self-similarity in the magnetic fields generated by the ablative nonlinear Rayleigh-Taylor instability. Phys Rev Lett 2013; 110:185003. [PMID: 23683208 DOI: 10.1103/physrevlett.110.185003] [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: 02/13/2013] [Indexed: 06/02/2023]
Abstract
Magnetic fields generated by the nonlinear Rayleigh-Taylor growth of laser-seeded three-dimensional broadband perturbations were measured in laser-accelerated planar targets using ultrafast proton radiography. The experimental data show self-similar behavior in the growing cellular magnetic field structures. These observations are consistent with a bubble competition and merger model that predicts the time evolution of the number and size of the bubbles, linking the cellular magnetic field structures with the Rayleigh-Taylor bubble and spike growth.
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Affiliation(s)
- L Gao
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
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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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Casey DT, Frenje JA, Gatu Johnson M, Séguin FH, Li CK, Petrasso RD, Glebov VY, Katz J, Knauer JP, Meyerhofer DD, Sangster TC, Bionta RM, Bleuel DL, Döppner T, Glenzer S, Hartouni E, Hatchett SP, Le Pape S, Ma T, MacKinnon A, McKernan MA, Moran M, Moses E, Park HS, Ralph J, Remington BA, Smalyuk V, Yeamans CB, Kline J, Kyrala G, Chandler GA, Leeper RJ, Ruiz CL, Cooper GW, Nelson AJ, Fletcher K, Kilkenny J, Farrell M, Jasion D, Paguio R. Measuring the absolute deuterium-tritium neutron yield using the magnetic recoil spectrometer at OMEGA and the NIF. Rev Sci Instrum 2012; 83:10D912. [PMID: 23126915 DOI: 10.1063/1.4738657] [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: 06/01/2023]
Abstract
A magnetic recoil spectrometer (MRS) has been installed and extensively used on OMEGA and the National Ignition Facility (NIF) for measurements of the absolute neutron spectrum from inertial confinement fusion implosions. From the neutron spectrum measured with the MRS, many critical implosion parameters are determined including the primary DT neutron yield, the ion temperature, and the down-scattered neutron yield. As the MRS detection efficiency is determined from first principles, the absolute DT neutron yield is obtained without cross-calibration to other techniques. The MRS primary DT neutron measurements at OMEGA and the NIF are shown to be in excellent agreement with previously established yield diagnostics on OMEGA, and with the newly commissioned nuclear activation diagnostics on the NIF.
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Affiliation(s)
- D T Casey
- Plasma Science and Fusion Center, MIT, Cambridge, Massachusetts 02139, USA.
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