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Title: Magnetized directly-driven ICF capsules: increased instability growth from non-uniform laser drive

Abstract

Simulations anticipate increased perturbation growth from non-uniform laser heating for magnetized direct-drive implosions. At the capsule pole, where the magnetic field is normal to the ablator surface, the field remains in the conduction zone and suppresses non-radial thermal conduction; in unmagnetized implosions this non-radial heat-flow is crucial in mitigating laser heating imbalances. Single-mode simulations show the magnetic field particularly amplifying short wavelength perturbations, whose behavior is dominated by thermal conduction. The most unstable wavelength can also become shorter. 3D multi-mode simulations of the capsule pole reinforce these findings, with increased perturbation growth anticipated across a wide range of scales. Finally, the results indicate that high-gain spherical direct-drive implosions require greater constraints on the laser heating uniformity when magnetized.

Authors:
 [1];  [2];  [2]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Imperial College, London (United Kingdom)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1808756
Alternate Identifier(s):
OSTI ID: 1657310
Report Number(s):
LLNL-JRNL-811824
Journal ID: ISSN 0029-5515; 1018138
Grant/Contract Number:  
AC52-07NA27344; 20-SI-002
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 60; Journal Issue: 10; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; plasma physics

Citation Formats

Walsh, C. A., Crilly, A. J., and Chittenden, J. P.. Magnetized directly-driven ICF capsules: increased instability growth from non-uniform laser drive. United States: N. p., 2020. Web. https://doi.org/10.1088/1741-4326/abab52.
Walsh, C. A., Crilly, A. J., & Chittenden, J. P.. Magnetized directly-driven ICF capsules: increased instability growth from non-uniform laser drive. United States. https://doi.org/10.1088/1741-4326/abab52
Walsh, C. A., Crilly, A. J., and Chittenden, J. P.. Wed . "Magnetized directly-driven ICF capsules: increased instability growth from non-uniform laser drive". United States. https://doi.org/10.1088/1741-4326/abab52. https://www.osti.gov/servlets/purl/1808756.
@article{osti_1808756,
title = {Magnetized directly-driven ICF capsules: increased instability growth from non-uniform laser drive},
author = {Walsh, C. A. and Crilly, A. J. and Chittenden, J. P.},
abstractNote = {Simulations anticipate increased perturbation growth from non-uniform laser heating for magnetized direct-drive implosions. At the capsule pole, where the magnetic field is normal to the ablator surface, the field remains in the conduction zone and suppresses non-radial thermal conduction; in unmagnetized implosions this non-radial heat-flow is crucial in mitigating laser heating imbalances. Single-mode simulations show the magnetic field particularly amplifying short wavelength perturbations, whose behavior is dominated by thermal conduction. The most unstable wavelength can also become shorter. 3D multi-mode simulations of the capsule pole reinforce these findings, with increased perturbation growth anticipated across a wide range of scales. Finally, the results indicate that high-gain spherical direct-drive implosions require greater constraints on the laser heating uniformity when magnetized.},
doi = {10.1088/1741-4326/abab52},
journal = {Nuclear Fusion},
number = 10,
volume = 60,
place = {United States},
year = {2020},
month = {8}
}

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