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

Abstract

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.

Authors:
ORCiD logo [1];  [1];  [1]; ORCiD logo [1];  [1];  [1];  [1]; ORCiD logo [1];  [1];  [2];  [1];  [1];  [1];  [1];  [1];  [1];  [3];  [3];  [4];  [4] more »;  [4]; ORCiD logo [5];  [5]; ORCiD logo [6];  [6]; ORCiD logo [6] « less
+ Show Author Affiliations
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. General Atomics, San Diego, CA (United States)
  5. Univ. of Rochester Lab. for Laser Energetics, Rochester, NY (United States)
  6. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1228755
Alternate Identifier(s):
OSTI ID: 1871383
Report Number(s):
LA-UR-14-27972; LLNL-JRNL-835511
Journal ID: ISSN 1070-664X; PHPAEN
Grant/Contract Number:  
AC52-06NA25396; AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 9; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; irradiance; X-ray imaging; neutrons; experiment design; hot carriers

Citation Formats

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., and Petrasso, R. D. Laser irradiance scaling in polar direct drive implosions on the National Ignition Facility. United States: N. p., 2015. Web. doi:10.1063/1.4931092.
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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. Laser irradiance scaling in polar direct drive implosions on the National Ignition Facility. United States. https://doi.org/10.1063/1.4931092
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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., and Petrasso, R. D. Thu . "Laser irradiance scaling in polar direct drive implosions on the National Ignition Facility". United States. https://doi.org/10.1063/1.4931092. https://www.osti.gov/servlets/purl/1228755.
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@article{osti_1228755,
title = {Laser irradiance scaling in polar direct drive implosions on the National Ignition Facility},
author = {Murphy, T. J. and Krasheninnikova, N. S. and Kyrala, G. A. and Bradley, P. A. and Baumgaertel, J. A. and Cobble, J. A. and Hakel, P. and Hsu, S. C. and Kline, J. L. and Montgomery, D. S. and Obrey, K. A. D. and Shah, R. C. and Tregillis, I. L. and Schmitt, M. J. and Kanzleiter, R. J. and Batha, S. H. and Wallace, R. J. and Bhandarkar, S. D. and Fitzsimmons, P. and Hoppe, M. L. and Nikroo, A. and Hohenberger, M. and McKenty, P. W. and Rinderknecht, H. G. and Rosenberg, M. J. and Petrasso, R. D.},
abstractNote = {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.},
doi = {10.1063/1.4931092},
journal = {Physics of Plasmas},
number = 9,
volume = 22,
place = {United States},
year = {Thu Sep 17 00:00:00 EDT 2015},
month = {Thu Sep 17 00:00:00 EDT 2015}
}
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https://doi.org/10.1063/1.4931092
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    Works referencing / citing this record:

    Mitigation of cross-beam energy transfer in ignition-scale polar-direct-drive target designs for the National Ignition Facility
    journal, July 2018

    • Collins, T. J. B.; Marozas, J. A.
    • Physics of Plasmas, Vol. 25, Issue 7
    • DOI: 10.1063/1.5039513

    Direct drive: Simulations and results from the National Ignition Facility
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    • Radha, P. B.; Hohenberger, M.; Edgell, D. H.
    • Physics of Plasmas, Vol. 23, Issue 5
    • DOI: 10.1063/1.4946023

    Development and modeling of a polar-direct-drive exploding pusher platform at the National Ignition Facility
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    • Ellison, C. Leland; Whitley, Heather D.; Brown, Colin R. D.
    • Physics of Plasmas, Vol. 25, Issue 7
    • DOI: 10.1063/1.5025724

    Time history prediction of direct-drive implosions on the Omega facility
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    • Physics of Plasmas, Vol. 23, Issue 1
    • DOI: 10.1063/1.4939833
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