Laser irradiance scaling in polar direct drive implosions on the National Ignition Facility

Murphy, T. J.; Krasheninnikova, N. S.; Kyrala, G. A.; Bradley, P. A.; Baumgaertel, J. A.; Cobble, J. A.; Hakel, P.; Hsu, S. C.; Kline, J. L.; Montgomery, D. S.; Obrey, K. A. D.; Shah, R. C.; Tregillis, I. L.; Schmitt, M. J.; Kanzleiter, R. J.; Batha, S. H.; Wallace, R. J.; Bhandarkar, S. D.; Fitzsimmons, P.; Hoppe, M. L.; Nikroo, A.; Hohenberger, M.; McKenty, P. W.; Rinderknecht, H. G.; Rosenberg, M. J.; Petrasso, R. D.

doi:10.1063/1.4931092

Title: Laser irradiance scaling in polar direct drive implosions on the National Ignition Facility

Journal Article · Thu Sep 17 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4931092· OSTI ID:1228755

^[1]; Krasheninnikova, N. S. ^[1]; Kyrala, G. A. ^[1];

^[1]; Baumgaertel, J. A. ^[1]; Cobble, J. A. ^[1]; Hakel, P. ^[1];

^[1]; Kline, J. L. ^[1]; Montgomery, D. S. ^[2]; Obrey, K. A. D. ^[1]; Shah, R. C. ^[1]; Tregillis, I. L. ^[1]; Schmitt, M. J. ^[1]; Kanzleiter, R. J. ^[1]; Batha, S. H. ^[1]; Wallace, R. J. ^[3]; Bhandarkar, S. D. ^[3]; Fitzsimmons, P. ^[4]; Hoppe, M. L. ^[4] more »

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
General Atomics, San Diego, CA (United States)
Univ. of Rochester Lab. for Laser Energetics, Rochester, NY (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Polar-direct-drive experiments conducted at the National Ignition Facility [E. I. Moses, Fusion Sci. Technol. 54, 361 (2008)] performed at laser irradiance between 1 and 2×10¹⁵ W/cm² exhibit increased hard x-ray emission, decreased neutron yield, and reduced areal density as the irradiance is increased. Experimental x-ray images at the higher irradiances show x-ray emission at the equator, as well as degraded symmetry, that is not predicted in hydrodynamic simulations using flux-limited energy transport, but that appear when non-local electron transport together with a model to account for cross beam energy transfer (CBET) is utilized. The reduction in laser power for equatorial beams required in the simulations to reproduce the effects of CBET on the observed symmetry also reproduces the yield degradation consistent with experimental data.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

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

Grant/Contract Number:: AC52-06NA25396; AC52-07NA27344

OSTI ID:: 1228755

Alternate ID(s):: OSTI ID: 1871383

Report Number(s):: LA-UR-14-27972; LLNL-JRNL-835511; PHPAEN

Journal Information:: Physics of Plasmas, Vol. 22, Issue 9; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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Cited By (4)

Mitigation of cross-beam energy transfer in ignition-scale polar-direct-drive target designs for the National Ignition Facility Collins, T. J. B.; Marozas, J. A. Physics of Plasmas, Vol. 25, Issue 7 https://doi.org/10.1063/1.5039513	journal	July 2018
Direct drive: Simulations and results from the National Ignition Facility Radha, P. B.; Hohenberger, M.; Edgell, D. H. Physics of Plasmas, Vol. 23, Issue 5 https://doi.org/10.1063/1.4946023	journal	April 2016
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
Time history prediction of direct-drive implosions on the Omega facility Laffite, S.; Bourgade, J. L.; Caillaud, T. Physics of Plasmas, Vol. 23, Issue 1 https://doi.org/10.1063/1.4939833	journal	January 2016

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Title: Laser irradiance scaling in polar direct drive implosions on the National Ignition Facility

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