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

Abstract

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.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [3];  [1];  [1];  [1];  [1] more »;  [1];  [1];  [4];  [2];  [1];  [3];  [1];  [1];  [3];  [1];  [3] « less
+ Show Author Affiliations
  1. Univ. of Rochester, Rochester, NY (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Univ. of Rochester, NY (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1255561
Alternate Identifier(s):
OSTI ID: 1248063; OSTI ID: 1341952
Report Number(s):
LLNL-JRNL-704522
Journal ID: ISSN 1070-664X; 2015-124; TIC-1272
Grant/Contract Number:  
NA0001944; AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 5; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; light scattering; trajectory models; shell model; laser ablation; visible spectra; 42 ENGINEERING; 70 PLASMA PHYSICS AND FUSION

Citation Formats

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., and Zylstra, A. Direct drive: Simulations and results from the National Ignition Facility. United States: N. p., 2016. Web. doi:10.1063/1.4946023.
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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. Direct drive: Simulations and results from the National Ignition Facility. United States. https://doi.org/10.1063/1.4946023
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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., and Zylstra, A. Tue . "Direct drive: Simulations and results from the National Ignition Facility". United States. https://doi.org/10.1063/1.4946023. https://www.osti.gov/servlets/purl/1255561.
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@article{osti_1255561,
title = {Direct drive: Simulations and results from the National Ignition Facility},
author = {Radha, P. B. and Hohenberger, M. and Edgell, D. H. and Marozas, J. A. and Marshall, F. J. and Michel, D. T. and Rosenberg, M. J. and Seka, W. and Shvydky, A. and Boehly, T. R. and Collins, T. J. B. and Campbell, E. M. and Craxton, R. S. and Delettrez, J. A. and Dixit, S. N. and Frenje, J. A. and Froula, D. H. and Goncharov, V. N. and Hu, S. X. and Knauer, J. P. and McCrory, R. L. and McKenty, P. W. and Meyerhofer, D. D. and Moody, J. and Myatt, J. F. and Petrasso, R. D. and Regan, S. P. and Sangster, T. C. and Sio, H. and Skupsky, S. and Zylstra, A.},
abstractNote = {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.},
doi = {10.1063/1.4946023},
journal = {Physics of Plasmas},
number = 5,
volume = 23,
place = {United States},
year = {Tue Apr 19 00:00:00 EDT 2016},
month = {Tue Apr 19 00:00:00 EDT 2016}
}
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https://doi.org/10.1063/1.4946023
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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

    Laser-direct-drive program: Promise, challenge, and path forward
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    Mitigating laser-imprint effects in direct-drive inertial confinement fusion implosions with an above-critical-density foam layer
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    • Hu, S. X.; Theobald, W.; Radha, P. B.
    • Physics of Plasmas, Vol. 25, Issue 8
    • DOI: 10.1063/1.5044609

    Development and modeling of a polar-direct-drive exploding pusher platform at the National Ignition Facility
    journal, July 2018

    • Ellison, C. Leland; Whitley, Heather D.; Brown, Colin R. D.
    • Physics of Plasmas, Vol. 25, Issue 7
    • DOI: 10.1063/1.5025724

    Study of high-Z-coated ignition target by detailed configuration accounting atomic physics for direct-drive inertial confinement fusion
    journal, November 2018

    Wavelength-detuning cross-beam energy transfer mitigation scheme for direct drive: Modeling and evidence from National Ignition Facility implosions
    journal, May 2018

    • Marozas, J. A.; Hohenberger, M.; Rosenberg, M. J.
    • Physics of Plasmas, Vol. 25, Issue 5
    • DOI: 10.1063/1.5022181
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