Examining the radiation drive asymmetries present in the high foot series of implosion experiments at the National Ignition Facility

Pak, A.; Divol, L.; Kritcher, A. L.; Ma, T.; Ralph, J. E.; Bachmann, B.; Benedetti, L. R.; Casey, D. T.; Celliers, P. M.; Dewald, E. L.; Döppner, T.; Field, J. E.; Fratanduono, D. E.; Berzak Hopkins, L. F.; Izumi, N.; Khan, S. F.; Landen, O. L.; Kyrala, G. A.; LePape, S.; Millot, M.; Milovich, J. L.; Moore, A. S.; Nagel, S. R.; Park, H. -S.; Rygg, J. R.; Bradley, D. K.; Callahan, D. A.; Hinkel, D. E.; Hsing, W. W.; Hurricane, O. A.; Meezan, N. B.; Moody, J. D.; Patel, P.; Robey, H. F.; Schneider, M. B.; Town, R. P.  J.; Edwards, M. J.

doi:10.1063/1.4979192

Title: Examining the radiation drive asymmetries present in the high foot series of implosion experiments at the National Ignition Facility

Journal Article · Fri Mar 24 00:00:00 EDT 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4979192· OSTI ID:1378553

Pak, A. ^[1]; Divol, L. ^[1]; Kritcher, A. L. ^[1]; Ma, T. ^[1]; Ralph, J. E. ^[1]; Bachmann, B. ^[1];

^[1]; Casey, D. T. ^[1]; Celliers, P. M. ^[1]; Dewald, E. L. ^[1]; Döppner, T. ^[1]; Field, J. E. ^[1]; Fratanduono, D. E. ^[1];

^[1]; Izumi, N. ^[1]; Khan, S. F. ^[1];

^[1]; Kyrala, G. A. ^[2]; LePape, S. ^[1];

^[1] more »

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

This paper details and examines the origins of radiation drive asymmetries present during the initial High Foot implosion experiments. Such asymmetries are expected to reduce the stagnation pressure and the resulting yield of these experiments by several times. Analysis of reemission and dual axis shock timing experiments indicates that a flux asymmetry, with a P2/P0 amplitude that varies from -10 to -5 %, is present during the first shock of the implosion. This first shock asymmetry can be corrected through adjustments to the laser cone fraction. A thin shell model and more detailed radiation hydrodynamic calculations indicate that an additional negative P2/P0 asymmetry during the second or portions of the third shock is required to reach the observed amount of asymmetry in the shape of the ablator at peak implosion velocity. In conjunction with symmetry data from the x-ray self emission produced at stagnation, these models also indicate that after the initially negative P2/P0 flux asymmetry, the capsule experiences a positive P2/P0 flux asymmetry that develops at or before ~2 ns into the peak of the laser power. Here, direct evidence for this inference, using measurements of the x-ray emission produced by the lasers irradiating the hohlraum, is presented. This data indicates that the reduction in the transmitted inner laser cone energy results from impeded propagation through the plasma associated with the ablation of the capsule target. This paper also correlates measurements of the outer cone laser deposition location with variations in the observed x-ray self emission shape from experiments conducted with nominally the same input conditions.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1378553

Alternate ID(s):: OSTI ID: 1348041

Report Number(s):: LLNL-JRNL-718397; PHPAEN

Journal Information:: Physics of Plasmas, Vol. 24, Issue 5; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 29 works

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On the importance of minimizing “coast-time” in x-ray driven inertially confined fusion implosions Hurricane, O. A.; Kritcher, A.; Callahan, D. A. Physics of Plasmas, Vol. 24, Issue 9 https://doi.org/10.1063/1.4994856	journal	September 2017
Comparison of plastic, high density carbon, and beryllium as indirect drive NIF ablators Kritcher, A. L.; Clark, D.; Haan, S. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5018000	journal	May 2018
Implosion shape control of high-velocity, large case-to-capsule ratio beryllium ablators at the National Ignition Facility Loomis, E. N.; Yi, S. A.; Kyrala, G. A. Physics of Plasmas, Vol. 25, Issue 7 https://doi.org/10.1063/1.5040995	journal	July 2018
Octahedral spherical Hohlraum for Rev. 6 NIF beryllium capsule Ren, Guoli; Lan, Ke; Chen, Yao-Hua Physics of Plasmas, Vol. 25, Issue 10 https://doi.org/10.1063/1.5041026	journal	October 2018
The Crystal Backlighter Imager: A spherically bent crystal imager for radiography on the National Ignition Facility Hall, G. N.; Krauland, C. M.; Schollmeier, M. S. Review of Scientific Instruments, Vol. 90, Issue 1 https://doi.org/10.1063/1.5058700	journal	January 2019
Impact of imposed mode 2 laser drive asymmetry on inertial confinement fusion implosions Gatu Johnson, M.; Appelbe, B. D.; Chittenden, J. P. Physics of Plasmas, Vol. 26, Issue 1 https://doi.org/10.1063/1.5066435	journal	January 2019
A simulation-based model for understanding the time dependent x-ray drive asymmetries and error bars in indirectly driven implosions on the National Ignition Facility Masse, L.; Clark, D.; MacLaren, S. Physics of Plasmas, Vol. 26, Issue 6 https://doi.org/10.1063/1.5092827	journal	June 2019
Maintaining low-mode symmetry control with extended pulse shapes for lower-adiabat Bigfoot implosions on the National Ignition Facility Hohenberger, M.; Casey, D. T.; Thomas, C. A. Physics of Plasmas, Vol. 26, Issue 11 https://doi.org/10.1063/1.5121435	journal	November 2019
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Beyond alpha-heating: driving inertially confined fusion implosions toward a burning-plasma state on the National Ignition Facility Hurricane, O. A.; Callahan, D. A.; Springer, P. T. Plasma Physics and Controlled Fusion, Vol. 61, Issue 1 https://doi.org/10.1088/1361-6587/aaed71	journal	November 2018
First Octahedral Spherical Hohlraum Energetics Experiment at the SGIII Laser Facility Huo, Wen Yi; Li, Zhichao; Chen, Yao-Hua Physical Review Letters, Vol. 120, Issue 16 https://doi.org/10.1103/physrevlett.120.165001	journal	April 2018
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Title: Examining the radiation drive asymmetries present in the high foot series of implosion experiments at the National Ignition Facility

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