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Title: Rarefaction Flows and Mitigation of Imprint in Direct-Drive Implosions

Abstract

Using highly resolved 3-D radiation-hydrodynamic simulations, we identify a novel mechanism by which the deleterious impact of laser imprinting is mitigated in direct-drive inertial confinement fusion. Unsupported shocks and associated rarefaction flows, commonly produced with short laser bursts, are found to reduce imprint modulations prior to target acceleration. Optimization through the choice of laser pulse with picket(s) and target dimensions may improve the stability of lower adiabat designs, thus providing the necessary margin for ignition-relevant implosions.

Authors:
 [1];  [2];  [1];  [1];  [1];  [1];  [1];  [2];  [1];  [1]
  1. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
  2. Naval Research Lab. (NRL), Washington, DC (United States). Plasma Physics Div.
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
Contributing Org.:
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
OSTI Identifier:
1560055
Alternate Identifier(s):
OSTI ID: 1547983
Report Number(s):
2018-299, 1510
Journal ID: ISSN 0031-9007; PRLTAO; 2018-299, 2470, 1510; TRN: US2000449
Grant/Contract Number:  
NA0003856
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 123; Journal Issue: 6; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Igumenshchev, I. V., Velikovich, A. L., Goncharov, V. N., Betti, R., Campbell, E. M., Knauer, J. P., Regan, S. P., Schmitt, A. J., Shah, R. C., and Shvydky, A. Rarefaction Flows and Mitigation of Imprint in Direct-Drive Implosions. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.123.065001.
Igumenshchev, I. V., Velikovich, A. L., Goncharov, V. N., Betti, R., Campbell, E. M., Knauer, J. P., Regan, S. P., Schmitt, A. J., Shah, R. C., & Shvydky, A. Rarefaction Flows and Mitigation of Imprint in Direct-Drive Implosions. United States. https://doi.org/10.1103/PhysRevLett.123.065001
Igumenshchev, I. V., Velikovich, A. L., Goncharov, V. N., Betti, R., Campbell, E. M., Knauer, J. P., Regan, S. P., Schmitt, A. J., Shah, R. C., and Shvydky, A. Tue . "Rarefaction Flows and Mitigation of Imprint in Direct-Drive Implosions". United States. https://doi.org/10.1103/PhysRevLett.123.065001. https://www.osti.gov/servlets/purl/1560055.
@article{osti_1560055,
title = {Rarefaction Flows and Mitigation of Imprint in Direct-Drive Implosions},
author = {Igumenshchev, I. V. and Velikovich, A. L. and Goncharov, V. N. and Betti, R. and Campbell, E. M. and Knauer, J. P. and Regan, S. P. and Schmitt, A. J. and Shah, R. C. and Shvydky, A.},
abstractNote = {Using highly resolved 3-D radiation-hydrodynamic simulations, we identify a novel mechanism by which the deleterious impact of laser imprinting is mitigated in direct-drive inertial confinement fusion. Unsupported shocks and associated rarefaction flows, commonly produced with short laser bursts, are found to reduce imprint modulations prior to target acceleration. Optimization through the choice of laser pulse with picket(s) and target dimensions may improve the stability of lower adiabat designs, thus providing the necessary margin for ignition-relevant implosions.},
doi = {10.1103/PhysRevLett.123.065001},
journal = {Physical Review Letters},
number = 6,
volume = 123,
place = {United States},
year = {Tue Aug 06 00:00:00 EDT 2019},
month = {Tue Aug 06 00:00:00 EDT 2019}
}

Journal Article:

Citation Metrics:
Cited by: 9 works
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Figures / Tables:

FIG. 1 FIG. 1: (a) Imprint modulations (the green area) localized at the ablation front can feed-through to an imploding shell compressed by a supported shock and (b) cannot do this in a shell compressed by a unsupported shock.

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.