Direct drive: Simulations and results from the National Ignition Facility

Radha, P. B.; Hohenberger, M.; Edgell, D. H.; Marozas, J. A.; Marshall, F. J.; Michel, D. T.; Rosenberg, M. J.; Seka, W.; Shvydky, A.; Boehly, T. R.; Collins, T. J. B.; Campbell, E. M.; Craxton, R. S.; Delettrez, J. A.; Dixit, S. N.; Frenje, J. A.; Froula, D. H.; Goncharov, V. N.; Hu, S. X.; Knauer, J. P.; McCrory, R. L.; McKenty, P. W.; Meyerhofer, D. D.; Moody, J.; Myatt, J. F.; Petrasso, R. D.; Regan, S. P.; Sangster, T. C.; Sio, H.; Skupsky, S.; Zylstra, A.

doi:10.1063/1.4946023

Title: Direct drive: Simulations and results from the National Ignition Facility

Journal Article · Tue Apr 19 00:00:00 EDT 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4946023· OSTI ID:1255561

Radha, P. B. ^[1]; Hohenberger, M. ^[1]; Edgell, D. H. ^[1]; Marozas, J. A. ^[1]; Marshall, F. J. ^[1]; Michel, D. T. ^[1]; Rosenberg, M. J. ^[1]; Seka, W. ^[1]; Shvydky, A. ^[1]; Boehly, T. R. ^[1]; Collins, T. J. B. ^[1]; Campbell, E. M. ^[1]; Craxton, R. S. ^[1]; Delettrez, J. A. ^[1]; Dixit, S. N. ^[2]; Frenje, J. A. ^[3]; Froula, D. H. ^[1]; Goncharov, V. N. ^[1]; Hu, S. X. ^[1]; Knauer, J. P. ^[1] more »

Univ. of Rochester, Rochester, NY (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

For this study, direct-drive implosion physics is being investigated at the National Ignition Facility. The primary goal of the experiments is twofold: to validate modeling related to implosion velocity and to estimate the magnitude of hot-electron preheat. Implosion experiments indicate that the energetics is well-modeled when cross-beam energy transfer (CBET) is included in the simulation and an overall multiplier to the CBET gain factor is employed; time-resolved scattered light and scattered-light spectra display the correct trends. Trajectories from backlit images are well modeled, although those from measured self-emission images indicate increased shell thickness and reduced shell density relative to simulations. Sensitivity analyses indicate that the most likely cause for the density reduction is nonuniformity growth seeded by laser imprint and not laser-energy coupling. Hot-electron preheat is at tolerable levels in the ongoing experiments, although it is expected to increase after the mitigation of CBET. Future work will include continued model validation, imprint measurements, and mitigation of CBET and hot-electron preheat.

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Research Organization:: Univ. of Rochester, NY (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0001944; AC52-07NA27344

OSTI ID:: 1255561

Alternate ID(s):: OSTI ID: 1248063; OSTI ID: 1341952

Report Number(s):: LLNL-JRNL-704522; 2015-124; TIC-1272

Journal Information:: Physics of Plasmas, Vol. 23, Issue 5; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 31 works

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Laser-direct-drive program: Promise, challenge, and path forward Campbell, E. M.; Goncharov, V. N.; Sangster, T. C. Matter and Radiation at Extremes, Vol. 2, Issue 2 https://doi.org/10.1016/j.mre.2017.03.001	journal	March 2017
Optimization of a high-yield, low-areal-density fusion product source at the National Ignition Facility with applications in nucleosynthesis experiments Gatu Johnson, M.; Casey, D. T.; Hohenberger, M. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5017746	journal	May 2018
The National Direct-Drive Inertial Confinement Fusion Program Regan, S. P.; Goncharov, V. N.; Sangster, T. C. Nuclear Fusion, Vol. 59, Issue 3 https://doi.org/10.1088/1741-4326/aae9b5	journal	December 2018
Mitigating laser-imprint effects in direct-drive inertial confinement fusion implosions with an above-critical-density foam layer Hu, S. X.; Theobald, W.; Radha, P. B. Physics of Plasmas, Vol. 25, Issue 8 https://doi.org/10.1063/1.5044609	journal	August 2018
Development and modeling of a polar-direct-drive exploding pusher platform at the National Ignition Facility Ellison, C. Leland; Whitley, Heather D.; Brown, Colin R. D. Physics of Plasmas, Vol. 25, Issue 7 https://doi.org/10.1063/1.5025724	journal	July 2018
Study of high-Z-coated ignition target by detailed configuration accounting atomic physics for direct-drive inertial confinement fusion Qiao, Xiumei; Lan, Ke Plasma Physics and Controlled Fusion, Vol. 61, Issue 1 https://doi.org/10.1088/1361-6587/aae2dc	journal	November 2018
Wavelength-detuning cross-beam energy transfer mitigation scheme for direct drive: Modeling and evidence from National Ignition Facility implosions Marozas, J. A.; Hohenberger, M.; Rosenberg, M. J. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5022181	journal	May 2018

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