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Jeet J, Appelbe BD, Crilly AJ, Divol L, Eckart M, Hahn KD, Hartouni EP, Hayes A, Kerr S, Kim Y, Mariscal E, Moore AS, Ramirez A, Rusev G, Schlossberg DJ. Diagnosing up-scattered deuterium-tritium fusion neutrons produced in burning plasmas at the National Ignition Facility (invited). THE REVIEW OF SCIENTIFIC INSTRUMENTS 2024; 95:093521. [PMID: 39269238 DOI: 10.1063/5.0219671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2024] [Accepted: 08/12/2024] [Indexed: 09/15/2024]
Abstract
In the push to higher performance fusion plasmas, two critical quantities to diagnose are α-heat deposition that can improve and impurities mixed into the plasma that can limit performance. In high-density, highly collisional inertial confinement fusion burning plasmas, there is a significant probability that deuterium-tritium (DT) fusion products, 14.1 MeV neutrons and 3.5 MeV α-particles, will collide with and deposit energy onto ("up-scatter") surrounding deuterium and tritium fuel ions. These up-scattered D and T ions can then undergo fusion while in-flight and produce an up-scattered neutron (15-30 MeV). These reaction-in-flight (RIF) neutrons can then be uniquely identified in the measured neutron energy spectrum. The magnitude, shape, and relative size of this spectral feature can inform models of stopping-power in the DT plasma and hence is directly proportional to α-heat deposition. In addition, the RIF spectrum can be related to mix into the burning fuel, particularly relevant for high-Z shell and other emerging National Ignition Facility platforms. The neutron time-of-flight diagnostic upgrades needed to obtain this small signal, ∼10-5 times the primary DT neutron peak, will be discussed. Results from several gain > 1 implosions will be shown and compared to previous RIF spectra. Finally, comparisons of experimental data to a simplified computational model will be made.
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Affiliation(s)
- J Jeet
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B D Appelbe
- Centre for Inertial Fusion Studies, The Blackett Laboratory, Imperial College, London SW72AZ, United Kingdom
| | - A J Crilly
- Centre for Inertial Fusion Studies, The Blackett Laboratory, Imperial College, London SW72AZ, United Kingdom
| | - L Divol
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M Eckart
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - K D Hahn
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - E P Hartouni
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Hayes
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - S Kerr
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - Y Kim
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - E Mariscal
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A S Moore
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Ramirez
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - G Rusev
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - D J Schlossberg
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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Mei Z, Li Y, Song Y, Sheng L, Guo Q, Yan YH, Yin HQ. Performance studies of an ultrafast gamma Cherenkov imaging Screen based on Silica fibers array. Heliyon 2024; 10:e35885. [PMID: 39224272 PMCID: PMC11367032 DOI: 10.1016/j.heliyon.2024.e35885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2024] [Revised: 07/26/2024] [Accepted: 08/06/2024] [Indexed: 09/04/2024] Open
Abstract
High-energy gamma rays produced in inertial confinement fusion (ICF) experiments are crucial for studying implosion dynamics. These gamma rays, characterized by their extremely short durations, represent the least disturbed products of fusion, preserving vital birth information. To detect such γ-rays, ultrafast radiation detectors with high time resolution are necessary. This study introduces a newly developed Cherenkov optical image screen designed for ultra-fast gamma-ray imaging. Composed of pure quartz fiber material, the imaging screen features a single fiber pixel size of 0.6 mm and a thickness of 3 cm. Theoretical investigations explore the luminous time response and efficiency of the Cherenkov optical imaging screen under gamma-ray irradiation. Experimental validation was conducted using a steady-state gamma-ray source with an average energy of 1.25 MeV. Results demonstrate that the image screen achieves a spatial resolution limit of 0.75 mm. The temporal response exhibits a full width at half maximum of less than 0.4 ns when excited by a high-energy electron beam with a single pulse duration of several picoseconds.
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Affiliation(s)
- Zhang Mei
- State Key Lab of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Shanxi, Xi'an, 710024, China
| | - Yang Li
- State Key Lab of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Shanxi, Xi'an, 710024, China
| | - Yan Song
- State Key Lab of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Shanxi, Xi'an, 710024, China
| | - Liang Sheng
- State Key Lab of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Shanxi, Xi'an, 710024, China
| | - Quan Guo
- State Key Lab of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Shanxi, Xi'an, 710024, China
| | - Yi Hong Yan
- School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, China
| | - Hong Qiao Yin
- State Key Lab of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Shanxi, Xi'an, 710024, China
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Ralph JE, Ross JS, Zylstra AB, Kritcher AL, Robey HF, Young CV, Hurricane OA, Pak A, Callahan DA, Baker KL, Casey DT, Döppner T, Divol L, Hohenberger M, Pape SL, Patel PK, Tommasini R, Ali SJ, Amendt PA, Atherton LJ, Bachmann B, Bailey D, Benedetti LR, Berzak Hopkins L, Betti R, Bhandarkar SD, Biener J, Bionta RM, Birge NW, Bond EJ, Bradley DK, Braun T, Briggs TM, Bruhn MW, Celliers PM, Chang B, Chapman T, Chen H, Choate C, Christopherson AR, Clark DS, Crippen JW, Dewald EL, Dittrich TR, Edwards MJ, Farmer WA, Field JE, Fittinghoff D, Frenje J, Gaffney J, Gatu Johnson M, Glenzer SH, Grim GP, Haan S, Hahn KD, Hall GN, Hammel BA, Harte J, Hartouni E, Heebner JE, Hernandez VJ, Herrmann HW, Herrmann MC, Hinkel DE, Ho DD, Holder JP, Hsing WW, Huang H, Humbird KD, Izumi N, Jarrott LC, Jeet J, Jones O, Kerbel GD, Kerr SM, Khan SF, Kilkenny J, Kim Y, Geppert-Kleinrath H, Geppert-Kleinrath V, Kong C, Koning JM, Kroll JJ, Kruse MKG, Kustowski B, Landen OL, Langer S, Larson D, Lemos NC, Lindl JD, Ma T, MacDonald MJ, MacGowan BJ, Mackinnon AJ, MacLaren SA, MacPhee AG, Marinak MM, Mariscal DA, Marley EV, Masse L, Meaney KD, Meezan NB, Michel PA, Millot M, Milovich JL, Moody JD, Moore AS, Morton JW, Murphy TJ, Newman K, Di Nicola JMG, Nikroo A, Nora R, Patel MV, Pelz LJ, Peterson JL, Ping Y, Pollock BB, Ratledge M, Rice NG, Rinderknecht HG, Rosen M, Rubery MS, Salmonson JD, Sater J, Schiaffino S, Schlossberg DJ, Schneider MB, Schroeder CR, Scott HA, Sepke SM, Sequoia K, Sherlock MW, Shin S, Smalyuk VA, Spears BK, Springer PT, Stadermann M, Stoupin S, Strozzi DJ, Suter LJ, Thomas CA, Town RPJ, Trosseille C, Tubman ER, Volegov PL, Weber CR, Widmann K, Wild C, Wilde CH, Van Wonterghem BM, Woods DT, Woodworth BN, Yamaguchi M, Yang ST, Zimmerman GB. The impact of low-mode symmetry on inertial fusion energy output in the burning plasma state. Nat Commun 2024; 15:2975. [PMID: 38582938 PMCID: PMC10998902 DOI: 10.1038/s41467-024-47302-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Accepted: 03/25/2024] [Indexed: 04/08/2024] Open
Abstract
Indirect Drive Inertial Confinement Fusion Experiments on the National Ignition Facility (NIF) have achieved a burning plasma state with neutron yields exceeding 170 kJ, roughly 3 times the prior record and a necessary stage for igniting plasmas. The results are achieved despite multiple sources of degradations that lead to high variability in performance. Results shown here, for the first time, include an empirical correction factor for mode-2 asymmetry in the burning plasma regime in addition to previously determined corrections for radiative mix and mode-1. Analysis shows that including these three corrections alone accounts for the measured fusion performance variability in the two highest performing experimental campaigns on the NIF to within error. Here we quantify the performance sensitivity to mode-2 symmetry in the burning plasma regime and apply the results, in the form of an empirical correction to a 1D performance model. Furthermore, we find the sensitivity to mode-2 determined through a series of integrated 2D radiation hydrodynamic simulations to be consistent with the experimentally determined sensitivity only when including alpha-heating.
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Affiliation(s)
- J E Ralph
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA.
| | - J S Ross
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA.
| | | | - A L Kritcher
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - H F Robey
- Los Alamos National Laboratory, Mail Stop F663, Los Alamos, NM, 87545, USA
| | - C V Young
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - O A Hurricane
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - A Pak
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | | | - K L Baker
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - D T Casey
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - T Döppner
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - L Divol
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - M Hohenberger
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - S Le Pape
- Laboratoire pour l'utilisation des Lasers Intenses chez École Polytechnique, F-91128, Palaiseau Cedex, France
| | - P K Patel
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - R Tommasini
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - S J Ali
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - P A Amendt
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - L J Atherton
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - B Bachmann
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - D Bailey
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - L R Benedetti
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - L Berzak Hopkins
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - R Betti
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, 14623, USA
| | - S D Bhandarkar
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - J Biener
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - R M Bionta
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - N W Birge
- Los Alamos National Laboratory, Mail Stop F663, Los Alamos, NM, 87545, USA
| | - E J Bond
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - D K Bradley
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - T Braun
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - T M Briggs
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - M W Bruhn
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - P M Celliers
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - B Chang
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - T Chapman
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - H Chen
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - C Choate
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - A R Christopherson
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - D S Clark
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | | | - E L Dewald
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - T R Dittrich
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - M J Edwards
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - W A Farmer
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - J E Field
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - D Fittinghoff
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - J Frenje
- Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - J Gaffney
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - M Gatu Johnson
- Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - S H Glenzer
- SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
| | - G P Grim
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - S Haan
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - K D Hahn
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - G N Hall
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - B A Hammel
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - J Harte
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - E Hartouni
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - J E Heebner
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - V J Hernandez
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - H W Herrmann
- Los Alamos National Laboratory, Mail Stop F663, Los Alamos, NM, 87545, USA
| | - M C Herrmann
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - D E Hinkel
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - D D Ho
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - J P Holder
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - W W Hsing
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - H Huang
- General Atomics, San Diego, CA, 92186, USA
| | - K D Humbird
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - N Izumi
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - L C Jarrott
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - J Jeet
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - O Jones
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - G D Kerbel
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - S M Kerr
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - S F Khan
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - J Kilkenny
- General Atomics, San Diego, CA, 92186, USA
| | - Y Kim
- Los Alamos National Laboratory, Mail Stop F663, Los Alamos, NM, 87545, USA
| | | | | | - C Kong
- General Atomics, San Diego, CA, 92186, USA
| | - J M Koning
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - J J Kroll
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - M K G Kruse
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - B Kustowski
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - O L Landen
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - S Langer
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - D Larson
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - N C Lemos
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - J D Lindl
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - T Ma
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - M J MacDonald
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - B J MacGowan
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - A J Mackinnon
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - S A MacLaren
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - A G MacPhee
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - M M Marinak
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - D A Mariscal
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - E V Marley
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - L Masse
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - K D Meaney
- Los Alamos National Laboratory, Mail Stop F663, Los Alamos, NM, 87545, USA
| | - N B Meezan
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - P A Michel
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - M Millot
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - J L Milovich
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - J D Moody
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - A S Moore
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - J W Morton
- Atomic Weapons Establishment, Aldermaston, RG7 4PR, UK
| | - T J Murphy
- Los Alamos National Laboratory, Mail Stop F663, Los Alamos, NM, 87545, USA
| | - K Newman
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - J-M G Di Nicola
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - A Nikroo
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - R Nora
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - M V Patel
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - L J Pelz
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - J L Peterson
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - Y Ping
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - B B Pollock
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - M Ratledge
- General Atomics, San Diego, CA, 92186, USA
| | - N G Rice
- General Atomics, San Diego, CA, 92186, USA
| | - H G Rinderknecht
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, 14623, USA
| | - M Rosen
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - M S Rubery
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - J D Salmonson
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - J Sater
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - S Schiaffino
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - D J Schlossberg
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - M B Schneider
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - C R Schroeder
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - H A Scott
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - S M Sepke
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - K Sequoia
- General Atomics, San Diego, CA, 92186, USA
| | - M W Sherlock
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - S Shin
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - V A Smalyuk
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - B K Spears
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - P T Springer
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - M Stadermann
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - S Stoupin
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - D J Strozzi
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - L J Suter
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - C A Thomas
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, 14623, USA
| | - R P J Town
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - C Trosseille
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - E R Tubman
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - P L Volegov
- Los Alamos National Laboratory, Mail Stop F663, Los Alamos, NM, 87545, USA
| | - C R Weber
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - K Widmann
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - C Wild
- Diamond Materials Gmbh, 79108, Freiburg, Germany
| | - C H Wilde
- Pacific Fusion, Fremont, CA, 94538, USA
| | - B M Van Wonterghem
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - D T Woods
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - B N Woodworth
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | | | - S T Yang
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
| | - G B Zimmerman
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551-0808, USA
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4
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Pak A, Zylstra AB, Baker KL, Casey DT, Dewald E, Divol L, Hohenberger M, Moore AS, Ralph JE, Schlossberg DJ, Tommasini R, Aybar N, Bachmann B, Bionta RM, Fittinghoff D, Gatu Johnson M, Geppert Kleinrath H, Geppert Kleinrath V, Hahn KD, Rubery MS, Landen OL, Moody JD, Aghaian L, Allen A, Baxamusa SH, Bhandarkar SD, Biener J, Birge NW, Braun T, Briggs TM, Choate C, Clark DS, Crippen JW, Danly C, Döppner T, Durocher M, Erickson M, Fehrenbach T, Freeman M, Havre M, Hayes S, Hilsabeck T, Holder JP, Humbird KD, Hurricane OA, Izumi N, Kerr SM, Khan SF, Kim YH, Kong C, Jeet J, Kozioziemski B, Kritcher AL, Lamb KM, Lemos NC, MacGowan BJ, Mackinnon AJ, MacPhee AG, Marley EV, Meaney K, Millot M, Di Nicola JMG, Nikroo A, Nora R, Ratledge M, Ross JS, Shin SJ, Smalyuk VA, Stadermann M, Stoupin S, Suratwala T, Trosseille C, Van Wonterghem B, Weber CR, Wild C, Wilde C, Wooddy PT, Woodworth BN, Young CV. Observations and properties of the first laboratory fusion experiment to exceed a target gain of unity. Phys Rev E 2024; 109:025203. [PMID: 38491694 DOI: 10.1103/physreve.109.025203] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Accepted: 01/18/2024] [Indexed: 03/18/2024]
Abstract
An indirect-drive inertial fusion experiment on the National Ignition Facility was driven using 2.05 MJ of laser light at a wavelength of 351 nm and produced 3.1±0.16 MJ of total fusion yield, producing a target gain G=1.5±0.1 exceeding unity for the first time in a laboratory experiment [Phys. Rev. E 109, 025204 (2024)10.1103/PhysRevE.109.025204]. Herein we describe the experimental evidence for the increased drive on the capsule using additional laser energy and control over known degradation mechanisms, which are critical to achieving high performance. Improved fuel compression relative to previous megajoule-yield experiments is observed. Novel signatures of the ignition and burn propagation to high yield can now be studied in the laboratory for the first time.
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Affiliation(s)
- A Pak
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - A B Zylstra
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - K L Baker
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - D T Casey
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - E Dewald
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - L Divol
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - M Hohenberger
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - A S Moore
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - J E Ralph
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - D J Schlossberg
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - R Tommasini
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - N Aybar
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - B Bachmann
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - R M Bionta
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - D Fittinghoff
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - M Gatu Johnson
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - H Geppert Kleinrath
- Los Alamos National Laboratory, Mail Stop F663, Los Alamos, New Mexico 87545, USA
| | - V Geppert Kleinrath
- Los Alamos National Laboratory, Mail Stop F663, Los Alamos, New Mexico 87545, USA
| | - K D Hahn
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - M S Rubery
- 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
| | - J D Moody
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - L Aghaian
- General Atomics, San Diego, California 92186, USA
| | - A Allen
- General Atomics, San Diego, California 92186, USA
| | - S H Baxamusa
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - S D Bhandarkar
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - J Biener
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - N W Birge
- Los Alamos National Laboratory, Mail Stop F663, Los Alamos, New Mexico 87545, USA
| | - T Braun
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - T M Briggs
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - C Choate
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - D S Clark
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - J W Crippen
- General Atomics, San Diego, California 92186, USA
| | - C Danly
- Los Alamos National Laboratory, Mail Stop F663, Los Alamos, New Mexico 87545, USA
| | - T Döppner
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - M Durocher
- Los Alamos National Laboratory, Mail Stop F663, Los Alamos, New Mexico 87545, USA
| | - M Erickson
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | | | - M Freeman
- Los Alamos National Laboratory, Mail Stop F663, Los Alamos, New Mexico 87545, USA
| | - M Havre
- General Atomics, San Diego, California 92186, USA
| | - S Hayes
- General Atomics, San Diego, California 92186, USA
| | - T Hilsabeck
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - J P Holder
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - K D Humbird
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - O A Hurricane
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - N Izumi
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - S M Kerr
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - S F Khan
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - Y H Kim
- Los Alamos National Laboratory, Mail Stop F663, Los Alamos, New Mexico 87545, USA
| | - C Kong
- General Atomics, San Diego, California 92186, USA
| | - J Jeet
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - B Kozioziemski
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - A L Kritcher
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - K M Lamb
- Los Alamos National Laboratory, Mail Stop F663, Los Alamos, New Mexico 87545, USA
| | - N C Lemos
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - B J MacGowan
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - A J Mackinnon
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - A G MacPhee
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - E V Marley
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - K Meaney
- Los Alamos National Laboratory, Mail Stop F663, Los Alamos, New Mexico 87545, USA
| | - M Millot
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - J-M G Di Nicola
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - A Nikroo
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - R Nora
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - M Ratledge
- General Atomics, San Diego, California 92186, USA
| | - J S Ross
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - S J Shin
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - V A Smalyuk
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - M Stadermann
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - S Stoupin
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - T Suratwala
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - C Trosseille
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - B Van Wonterghem
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - C R Weber
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - C Wild
- Diamond Materials GmbH, 79108 Freiburg, Germany
| | - C Wilde
- Los Alamos National Laboratory, Mail Stop F663, Los Alamos, New Mexico 87545, USA
| | - P T Wooddy
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - B N Woodworth
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - C V Young
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
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5
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Casey D, MacGowan B, Hurricane O, Landen O, Nora R, Haan S, Kritcher A, Zylstra A, Ralph J, Dewald E, Hohenberger M, Pak A, Springer P, Weber C, Milovich J, Divol L, Hartouni E, Bionta R, Hahn K, Schlossberg D, Moore A, Gatu Johnson M. Diagnosing the origin and impact of low-mode asymmetries in ignition experiments at the National Ignition Facility. Phys Rev E 2023; 108:L053203. [PMID: 38115512 DOI: 10.1103/physreve.108.l053203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Accepted: 10/17/2023] [Indexed: 12/21/2023]
Abstract
Inertial confinement fusion ignition requires high inflight shell velocity, good energy coupling between the hotspot and shell, and high areal density at peak compression. Three-dimensional asymmetries caused by imperfections in the drive symmetry or target can grow and damage the coupling and confinement. Recent high-yield experiments have shown that low-mode asymmetries are a key degradation mechanism and contribute to variability. We show the experimental signatures and impacts of asymmetry change with increasing implosion yield given the same initial cause. This letter has implications for improving robustness to a key degradation in ignition experiments.
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Affiliation(s)
- D Casey
- Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
| | - B MacGowan
- Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
| | - O Hurricane
- Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
| | - O Landen
- Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
| | - R Nora
- Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
| | - S Haan
- Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
| | - A Kritcher
- Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
| | - A Zylstra
- Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
| | - J Ralph
- Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
| | - E Dewald
- Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
| | - M Hohenberger
- Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
| | - A Pak
- Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
| | - P Springer
- Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
| | - C Weber
- Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
| | - J Milovich
- Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
| | - L Divol
- Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
| | - E Hartouni
- Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
| | - R Bionta
- Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
| | - K Hahn
- Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
| | - D Schlossberg
- Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
| | - A Moore
- Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
| | - M Gatu Johnson
- Massachusetts Institute of Technology (MIT), Cambridge, 02139 Massachusetts, USA
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6
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Pak A, Divol L, Casey DT, Khan SF, Kritcher AL, Ralph JE, Tommasini R, Trosseille C, Zylstra AB, Baker KL, Birge NW, Bionta R, Bachmann B, Dewald EL, Doeppner T, Freeman MS, Fittinghoff DN, Geppert-Kleinrath V, Geppert-Kleinrath H, Hahn KD, Hohenberger M, Holder J, Kerr S, Kim Y, Kozioziemski B, Lamb K, MacGowan BJ, MacPhee AG, Meaney KD, Moore AS, Schlossberg DJ, Stoupin S, Volegov P, Wilde C, Young CV, Landen OL, Town RPJ. Dynamics and Power Balance of Near Unity Target Gain Inertial Confinement Fusion Implosions. PHYSICAL REVIEW LETTERS 2023; 131:065101. [PMID: 37625041 DOI: 10.1103/physrevlett.131.065101] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Accepted: 07/07/2023] [Indexed: 08/27/2023]
Abstract
The change in the power balance, temporal dynamics, emission weighted size, temperature, mass, and areal density of inertially confined fusion plasmas have been quantified for experiments that reach target gains up to 0.72. It is observed that as the target gain rises, increased rates of self-heating initially overcome expansion power losses. This leads to reacting plasmas that reach peak fusion production at later times with increased size, temperature, mass and with lower emission weighted areal densities. Analytic models are consistent with the observations and inferences for how these quantities evolve as the rate of fusion self-heating, fusion yield, and target gain increase. At peak fusion production, it is found that as temperatures and target gains rise, the expansion power loss increases to a near constant ratio of the fusion self-heating power. This is consistent with models that indicate that the expansion losses dominate the dynamics in this regime.
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Affiliation(s)
- A Pak
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - L Divol
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D T Casey
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S F Khan
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A L Kritcher
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J E Ralph
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Tommasini
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C Trosseille
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A B Zylstra
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - K L Baker
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - N W Birge
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - R Bionta
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B Bachmann
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - E L Dewald
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - T Doeppner
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M S Freeman
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - D N Fittinghoff
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | | | | | - K D Hahn
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M Hohenberger
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J Holder
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S Kerr
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - Y Kim
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - B Kozioziemski
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - K Lamb
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - B J MacGowan
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A G MacPhee
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - K D Meaney
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - A S Moore
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D J Schlossberg
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S Stoupin
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - P Volegov
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - C Wilde
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - C V Young
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - O L Landen
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R P J Town
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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7
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Moore AS, Schlossberg DJ, Appelbe BD, Chandler GA, Crilly AJ, Eckart MJ, Forrest CJ, Glebov VY, Grim GP, Hartouni EP, Hatarik R, Kerr SM, Kilkenny J, Knauer JP. Neutron time of flight (nToF) detectors for inertial fusion experiments. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2023; 94:061102. [PMID: 37862497 DOI: 10.1063/5.0133655] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Accepted: 05/14/2023] [Indexed: 10/22/2023]
Abstract
Neutrons generated in Inertial Confinement Fusion (ICF) experiments provide valuable information to interpret the conditions reached in the plasma. The neutron time-of-flight (nToF) technique is well suited for measuring the neutron energy spectrum due to the short time (100 ps) over which neutrons are typically emitted in ICF experiments. By locating detectors 10s of meters from the source, the neutron energy spectrum can be measured to high precision. We present a contextual review of the current state of the art in nToF detectors at ICF facilities in the United States, outlining the physics that can be measured, the detector technologies currently deployed and analysis techniques used.
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Affiliation(s)
- A S Moore
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - D J Schlossberg
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - B D Appelbe
- Centre for Inertial Fusion Studies, The Blackett Laboratory, Imperial College, London SW7 2AZ, United Kingdom
| | - G A Chandler
- Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
| | - A J Crilly
- Centre for Inertial Fusion Studies, The Blackett Laboratory, Imperial College, London SW7 2AZ, United Kingdom
| | - M J Eckart
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - C J Forrest
- Laboratory for Laser Energetics, University of Rochester, 250 E River Rd., Rochester, New York 14623, USA
| | - V Y Glebov
- Laboratory for Laser Energetics, University of Rochester, 250 E River Rd., Rochester, New York 14623, USA
| | - G P Grim
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - E P Hartouni
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - R Hatarik
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - S M Kerr
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - J Kilkenny
- General Atomics, San Diego, California 92121, USA
| | - J P Knauer
- Laboratory for Laser Energetics, University of Rochester, 250 E River Rd., Rochester, New York 14623, USA
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8
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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. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022; 93:113528. [PMID: 36461449 DOI: 10.1063/5.0101874] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [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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9
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Moore AS, Schlossberg DJ, Eckart MJ, Hartouni EP, Hilsabeck TJ, Jeet JS, Kerr SM, Nora RC, Kilkenny J. Constraining time-dependent ion temperature measurements in inertial confinement fusion (ICF) implosions with an intermediate distance neutron time-of-flight (nToF) detector. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022; 93:113536. [PMID: 36461534 DOI: 10.1063/5.0099933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Accepted: 09/19/2022] [Indexed: 06/17/2023]
Abstract
A concept for using an intermediate distance (0.3-3.0 m) neutron time-of-flight (nToF) to provide a constraint on the measurement of the time-dependence of ion temperature in inertial confinement fusion implosions is presented. Simulated nToF signals at different distances are generated and, with a priori knowledge of the burn-averaged quantities and burn history, analyzed to determine requirements for a future detector. Results indicate a signal-to-noise ratio >50 and time resolution <20 ps to constrain the ion temperature gradient to ∼±25% (0.5 keV/100 ps).
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Affiliation(s)
- A S Moore
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - D J Schlossberg
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - M J Eckart
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - E P Hartouni
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - T J Hilsabeck
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - J S Jeet
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - S M Kerr
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - R C Nora
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - J Kilkenny
- General Atomics, San Diego, California 92121, USA
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Jeet J, Zylstra AB, Rekow V, Hardy CM, Pelepchan N, Eckart M, Kim Y, Rubery M, Moore AS, Schlossberg DJ, Folsom E. The Vacuum Cherenkov Detector (VCD) for γ-ray measurements in inertial confinement fusion experiments. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022; 93:103543. [PMID: 36319345 DOI: 10.1063/5.0101830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Accepted: 08/11/2022] [Indexed: 06/16/2023]
Abstract
Inertial confinement fusion experiments at both the National Ignition Facility (NIF) and the Laboratory for Laser Energetics OMEGA laser facility currently utilize Cherenkov detectors, with fused silica as the Cherenkov medium. At the NIF, the Quartz Cherenkov Detectors improve the precision of neutron time-of-flight measurements; and at OMEGA, the Diagnostic for Areal Density provides measurements of capsule shell areal densities. An inherent property of fused silica is the radiator's relatively low energy threshold for Cherenkov photon production (Ethreshold < 1 MeV), making it advantageous over gas-based Cherenkov detectors for experiments requiring low-energy γ detection. The Vacuum Cherenkov Detector (VCD) has been specifically designed for efficient detection of low energy γ's. Its primary use is in implosion experiments, which will study reactions relevant to stellar and big-bang nucleosynthesis, such as T(4He,γ)7Li, 4He(3He,γ)7Be, and 12C(p,γ)13N. The VCD is compatible with LLE's standard Ten-Inch Manipulator diagnostic insertion module. This work will outline the design and characterization of the VCD as well as provide results from recent experiments conducted at the OMEGA laser facility.
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Affiliation(s)
- J Jeet
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A B Zylstra
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - V Rekow
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C M Hardy
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - N Pelepchan
- Laboratory for Laser Energetics, Rochester, New York 14623, USA
| | - M Eckart
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - Y Kim
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - M Rubery
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A S Moore
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D J Schlossberg
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - E Folsom
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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11
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Zylstra AB, Kritcher AL, Hurricane OA, Callahan DA, Ralph JE, Casey DT, Pak A, Landen OL, Bachmann B, Baker KL, Berzak Hopkins L, Bhandarkar SD, Biener J, Bionta RM, Birge NW, Braun T, Briggs TM, Celliers PM, Chen H, Choate C, Clark DS, Divol L, Döppner T, Fittinghoff D, Edwards MJ, Gatu Johnson M, Gharibyan N, Haan S, Hahn KD, Hartouni E, Hinkel DE, Ho DD, Hohenberger M, Holder JP, Huang H, Izumi N, Jeet J, Jones O, Kerr SM, Khan SF, Geppert Kleinrath H, Geppert Kleinrath V, Kong C, Lamb KM, Le Pape S, Lemos NC, Lindl JD, MacGowan BJ, Mackinnon AJ, MacPhee AG, Marley EV, Meaney K, Millot M, Moore AS, Newman K, Di Nicola JMG, Nikroo A, Nora R, Patel PK, Rice NG, Rubery MS, Sater J, Schlossberg DJ, Sepke SM, Sequoia K, Shin SJ, Stadermann M, Stoupin S, Strozzi DJ, Thomas CA, Tommasini R, Trosseille C, Tubman ER, Volegov PL, Weber CR, Wild C, Woods DT, Yang ST, Young CV. Experimental achievement and signatures of ignition at the National Ignition Facility. Phys Rev E 2022; 106:025202. [PMID: 36109932 DOI: 10.1103/physreve.106.025202] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Accepted: 07/06/2022] [Indexed: 06/15/2023]
Abstract
An inertial fusion implosion on the National Ignition Facility, conducted on August 8, 2021 (N210808), recently produced more than a megajoule of fusion yield and passed Lawson's criterion for ignition [Phys. Rev. Lett. 129, 075001 (2022)10.1103/PhysRevLett.129.075001]. We describe the experimental improvements that enabled N210808 and present the first experimental measurements from an igniting plasma in the laboratory. Ignition metrics like the product of hot-spot energy and pressure squared, in the absence of self-heating, increased by ∼35%, leading to record values and an enhancement from previous experiments in the hot-spot energy (∼3×), pressure (∼2×), and mass (∼2×). These results are consistent with self-heating dominating other power balance terms. The burn rate increases by an order of magnitude after peak compression, and the hot-spot conditions show clear evidence for burn propagation into the dense fuel surrounding the hot spot. These novel dynamics and thermodynamic properties have never been observed on prior inertial fusion experiments.
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Affiliation(s)
- A B Zylstra
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - A L Kritcher
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - O A Hurricane
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - D A Callahan
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - J E Ralph
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - D T Casey
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - A Pak
- 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
| | - B Bachmann
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - K L Baker
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - L Berzak Hopkins
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - S D Bhandarkar
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - J Biener
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - R M Bionta
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - N W Birge
- Los Alamos National Laboratory, Mail Stop F663, Los Alamos, New Mexico 87545, USA
| | - T Braun
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - T M Briggs
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - P M Celliers
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - H Chen
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - C Choate
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - D S Clark
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - L Divol
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - T Döppner
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - D Fittinghoff
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - M J Edwards
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - M Gatu Johnson
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - N Gharibyan
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - S Haan
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - K D Hahn
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - E Hartouni
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - D E Hinkel
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - D D Ho
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - M Hohenberger
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - J P Holder
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - H Huang
- General Atomics, San Diego, California 92186, USA
| | - N Izumi
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - J Jeet
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - O Jones
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - S M Kerr
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - S F Khan
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - H Geppert Kleinrath
- Los Alamos National Laboratory, Mail Stop F663, Los Alamos, New Mexico 87545, USA
| | - V Geppert Kleinrath
- Los Alamos National Laboratory, Mail Stop F663, Los Alamos, New Mexico 87545, USA
| | - C Kong
- General Atomics, San Diego, California 92186, USA
| | - K M Lamb
- Los Alamos National Laboratory, Mail Stop F663, Los Alamos, New Mexico 87545, USA
| | - S Le Pape
- Laboratoire pour l'utilisation des Lasers Intenses chez École Polytechnique, F-91128 Palaiseau cedex, France
| | - N C Lemos
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - J D Lindl
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - B J MacGowan
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - A J Mackinnon
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - A G MacPhee
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - E V Marley
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - K Meaney
- Los Alamos National Laboratory, Mail Stop F663, Los Alamos, New Mexico 87545, USA
| | - M Millot
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - A S Moore
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - K Newman
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - J-M G Di Nicola
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - A Nikroo
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - R Nora
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - P K Patel
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - N G Rice
- General Atomics, San Diego, California 92186, USA
| | - M S Rubery
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - J Sater
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - D J Schlossberg
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - S M Sepke
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - K Sequoia
- General Atomics, San Diego, California 92186, USA
| | - S J Shin
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - M Stadermann
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - S Stoupin
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - D J Strozzi
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - C A Thomas
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - R Tommasini
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - C Trosseille
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - E R Tubman
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - P L Volegov
- Los Alamos National Laboratory, Mail Stop F663, Los Alamos, New Mexico 87545, USA
| | - C R Weber
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - C Wild
- Diamond Materials Gmbh, 79108 Freiburg, Germany
| | - D T Woods
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - S T Yang
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - C V Young
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
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12
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Jeet J, Eckart M, Gjemso J, Hahn K, Hartouni EP, Kerr S, Mariscal E, Moore AS, Rubery M, Schlossberg DJ. Proof-of-concept of a neutron time-of-flight ellipsoidal detector. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2021; 92:043555. [PMID: 34243390 DOI: 10.1063/5.0043829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 04/03/2021] [Indexed: 06/13/2023]
Abstract
The time-resolved measurement of neutrons emitted from nuclear implosions at inertial confinement fusion facilities is used to characterize the fusing plasma. Several significant quantities are routinely measured by neutron time-of-flight (nToF) detectors in these experiments. Current nToF detectors use scintillators as well as solid-state Cherenkov radiators. The latter has an inherently faster time response and can provide a co-registered γ-ray measurement as well as improved precision in the bulk hot-spot velocity. This work discusses a nToF ellipsoidal detector that also utilizes a solid-state Cherenkov radiator. The detector has the potential to achieve a fast instrument response function allowing for characterization of the γ-ray burn history as well as the ability to field the detector closer to the fusion source. Proof-of-concept testing of the nToF ellipsoidal detector has been conducted at the National Ignition Facility using commercial optics. A time-resolved neutron signal has been measured from the diagnostic. Preliminary simulations corroborate the results.
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Affiliation(s)
- J Jeet
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M Eckart
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J Gjemso
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - K Hahn
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - E P Hartouni
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S Kerr
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - E Mariscal
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A S Moore
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M Rubery
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D J Schlossberg
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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13
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Hartouni EP, Bionta RM, Eckart MJ, Field JE, Grim GP, Hahn KD, Hatarik R, Jeet J, Kerr SM, Libby SB, Moore AS, Munro DH, Schlossberg DJ. Optimal choice of multiple line-of-sight measurements determining plasma hotspot velocity at the National Ignition Facility. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2021; 92:023513. [PMID: 33648112 DOI: 10.1063/5.0040319] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Accepted: 01/27/2021] [Indexed: 06/12/2023]
Abstract
The measurement of plasma hotspot velocity provides an important diagnostic of implosion performance for inertial confinement fusion experiments at the National Ignition Facility. The shift of the fusion product neutron mean kinetic energy as measured along multiple line-of-sight time-of-flight spectrometers provides velocity vector components from which the hotspot velocity is inferred. Multiple measurements improve the hotspot velocity inference; however, practical considerations of available space, operational overhead, and instrumentation costs limit the number of possible line-of-sight measurements. We propose a solution to this classical "experiment design" problem that optimizes the precision of the velocity inference for a limited number of measurements.
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Affiliation(s)
- E P Hartouni
- 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
| | - G P Grim
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - K D Hahn
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Hatarik
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J Jeet
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S M Kerr
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S B Libby
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A S Moore
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D H Munro
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D J Schlossberg
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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14
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Moore AS, Hartouni EP, Schlossberg D, Kerr S, Eckart M, Carrera J, Ma L, Waltz C, Barker D, Gjemso J, Mariscal E, Grim G, Kilkenny J. The five line-of-sight neutron time-of-flight (nToF) suite on the National Ignition Facility (NIF). THE REVIEW OF SCIENTIFIC INSTRUMENTS 2021; 92:023516. [PMID: 33648072 DOI: 10.1063/5.0040730] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 02/01/2021] [Indexed: 06/12/2023]
Abstract
Measurement of the neutron spectrum from inertial confinement fusion implosions is one of the primary diagnostics of implosion performance. Analysis of the spectrum gives access to quantities such as neutron yield, hot-spot velocity, apparent ion temperature, and compressed fuel ρr through measurement of the down-scatter ratio. On the National Ignition Facility, the neutron time-of-flight suite has been upgraded to include five independent, collimated lines of sight, each comprising a high dynamic range bibenzyl/diphenylacetylene-stilbene scintillator [R. Hatarik et al., Plasma Fusion Res. 9, 4404104 (2014)] and high-speed fused silica Cherenkov detectors [A. S. Moore et al., Rev. Sci. Instrum. 89, 10I120 (2018)].
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Affiliation(s)
- A S Moore
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - E P Hartouni
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - D Schlossberg
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - S Kerr
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - M Eckart
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - J Carrera
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - L Ma
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - C Waltz
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - D Barker
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - J Gjemso
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - E Mariscal
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - G Grim
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - J Kilkenny
- General Atomics, San Diego, California 92121, USA
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15
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Glebov VY, Stoeckl C, Forrest CJ, Knauer JP, Mannion OM, Romanofsky MH, Sangster TC, Regan SP. A novel photomultiplier tube neutron time-of-flight detector. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2021; 92:013509. [PMID: 33514216 DOI: 10.1063/5.0029005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Accepted: 12/26/2020] [Indexed: 06/12/2023]
Abstract
A traditional neutron time-of-flight (nTOF) detector used in inertial confinement fusion consists of a scintillator coupled with a photomultiplier tube (PMT). The instrument response function (IRF) of such a detector is dominated by the scintillator-light decay. In DT implosions with neutron yield larger than 1013, a novel detector consisting of a microchannel-plate (MCP) photomultiplier tube in a housing without a scintillator (PMT nTOF) can be used to measure DT yield, ion temperature, and neutron velocity. Most of the neutron signals in PMT nTOF detectors are produced from neutron interaction with a PMT window. The direct interaction of neutrons with the MCP provides negligible contribution. The elimination of the scintillator removes the scintillator decay from the instrument response function and makes the IRF of the PMT nTOF detector faster, which makes the ion temperature and neutron velocity measurements more accurate. Three PMT nTOF detectors were deployed in the OMEGA laser system for the first time to diagnose inertial confinement fusion plasma. The design details, characteristics, and calibration results of these detectors in DT implosions on OMEGA are presented. Recommendations on the use of different PMTs for specific applications are provided.
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Affiliation(s)
- V Yu Glebov
- Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623-1299, USA
| | - C Stoeckl
- Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623-1299, USA
| | - C J Forrest
- Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623-1299, USA
| | - J P Knauer
- Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623-1299, USA
| | - O M Mannion
- Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623-1299, USA
| | - M H Romanofsky
- Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623-1299, USA
| | - T C Sangster
- Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623-1299, USA
| | - S P Regan
- Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623-1299, USA
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16
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Schlossberg DJ, Moore AS, Beeman BV, Eckart MJ, Grim GP, Hartouni EP, Hatarik R, Rubery MS, Sayre DB, Waltz C. Ab initio response functions for Cherenkov-based neutron detectors. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:10I136. [PMID: 30399741 DOI: 10.1063/1.5039399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 07/27/2018] [Indexed: 06/08/2023]
Abstract
Neutron time-of-flight diagnostics at the NIF were recently outfitted with Cherenkov detectors. A fused silica radiator delivers sub-nanosecond response time and is optically coupled to a microchannel plate photomultiplier tube with gain from ∼1 to 104. Capitalizing on fast time response and gamma-ray sensitivity, these systems can provide better than 30 ps precision for measuring first moments of neutron distributions. Generation of ab initio instrument response functions (IRFs) is critical to meet the <1% uncertainty needed. A combination of Monte Carlo modeling, benchtop characterization, and in situ comparison is employed. Close agreement is shown between the modeled IRFs and in situ measurements using the NIF's short-pulse advanced radiographic capability beams. First and second moments of neutron spectra calculated using ab initio IRFs agree well with established scintillator measurements. Next-step designs offer increased sensitivity and time-response.
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Affiliation(s)
- D J Schlossberg
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A S Moore
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B V Beeman
- 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
| | - M S Rubery
- Atomic Weapons Establishment, Aldermaston, Berkshire RG7 4PR, United Kingdom
| | - D B Sayre
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C Waltz
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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17
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Hatarik R, Nora RC, Spears BK, Eckart MJ, Grim GP, Hartouni EP, Moore AS, Schlossberg DJ. Using multiple neutron time of flight detectors to determine the hot spot velocity. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:10I138. [PMID: 30399709 DOI: 10.1063/1.5039372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 06/11/2018] [Indexed: 06/08/2023]
Abstract
An important diagnostic value of a shot at the National Ignition Facility is the resultant center-of-mass motion of the imploding capsule. This residual velocity reduces the efficiency of converting laser energy into plasma temperature. A new analysis method extracts the effective hot spot motion by using information from multiple neutron time-of-flight (nToF) lines-of-sight (LoSs). This technique fits a near Gaussian spectrum to the nToF scope traces and overcomes reliance on models to relate the plasma temperature to the mean energy of the emitted neutrons. This method requires having at least four nToF LoSs. The results of this analysis will be compared to an approach where each LoS is analyzed separately and a model is used to infer the mean energy of the emitted neutrons.
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Affiliation(s)
- R Hatarik
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R C Nora
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B K Spears
- 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
| | - A S Moore
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D J Schlossberg
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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18
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Glebov VY, Eckart MJ, Forrest CJ, Grim GP, Hartouni EP, Hatarik R, Knauer JP, Moore AS, Regan SP, Sangster TC, Schlossberg DJ, Stoeckl C. Testing a Cherenkov neutron time-of-flight detector on OMEGA. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:10I122. [PMID: 30399883 DOI: 10.1063/1.5035289] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Accepted: 06/13/2018] [Indexed: 06/08/2023]
Abstract
A Cherenkov neutron time-of-flight (nTOF) detector developed and constructed at Lawrence Livermore National Laboratory was tested at 13 m from the target in a collimated line of sight (LOS) and at 5.3 m from the target in the open space inside the OMEGA Target Bay. Neutrons interacting with the quartz rod generate gammas, which through Compton scattering produce relativistic electrons that give rise to Cherenkov light. A photomultiplier tube (PMT) transferred the Cherenkov light into an amplified electrical signal. The Cherenkov nTOF detector consists of an 8-mm-diam, 25-cm quartz hexagonal prism coupled with a Hamamatsu gated PMT R5916U-52. The tests were performed with DT direct-drive implosions with cryogenic and room-temperature targets, producing a wide range of neutron yields and ion temperatures. The results of the tests and comparison with other nTOF detectors on OMEGA are presented. In the collimated LOS at 13 m from the target, the Cherenkov nTOF detector demonstrated good precision measurement in both the yield and ion temperature for DT yields above 3 × 1013.
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Affiliation(s)
- V Yu Glebov
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - M J Eckart
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C J Forrest
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, 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 P Knauer
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - A S Moore
- Lawrence Livermore National Laboratory, Livermore, California 94550, 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
| | - D J Schlossberg
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C Stoeckl
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
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19
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Gordon JM, Schlossberg DJ, Eckart MJ, Datte PS, Durand CE, Grim GP, Hartouni EP, Hatarik R, Moore AS. Characterization of photodetector temporal response for neutron time-of-flight (nToF) diagnostics at the National Ignition Facility. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:10I135. [PMID: 30399914 DOI: 10.1063/1.5039390] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 06/27/2018] [Indexed: 06/08/2023]
Abstract
The temporal response of a microchannel plate photomultiplier tube used in the suite of neutron time of flight (nToF) diagnostics at the National Ignition Facility has been characterized to reduce uncertainty in, and understanding of, shot parameters obtained from nTOF data. A short pulse laser, neutral density glass filters, and electrical attenuators were used to gather statistically significant samples of photodetector impulse response functions (IRF) in rapid succession. Individual components have been absolutely calibrated to minimize systematic uncertainties. The zeroth (collected charge), first (transit time), and second central moments (transit time spread) of the IRF were calculated as either the bias voltage or the amount of light incident on the detector was varied. Timing reference was provided by a monitor photodiode viewing a pickoff of the incident laser pulse. The primary sources of uncertainty are jitter in the monitor photodiode and the statistical variation across our measurement period. The spreads in the first moment, with respect to the timing photodiode, and the square root of the second central moment were found to be less than 50 ps and 150 ps, respectively.
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Affiliation(s)
- J M Gordon
- University of California, Berkeley, Berkeley, California 94720, USA
| | - D J Schlossberg
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M J Eckart
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - P S Datte
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C E Durand
- 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
| | - A S Moore
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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