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Title: Effects of asymmetry and hot-spot shape on ignition capsules

Abstract

Asymmetric implosion of inertial confinement fusion capsules is known, both experimentally and computationally, to reduce thermonuclear performance. This work shows that low-mode asymmetries degrade performance as a result of a decrease in the hydrodynamic disassembly time of the hot-spot core, which scales with the minimum dimension of the hot spot. The asymmetric shape of a hot spot results in decreased temperatures and areal densities and allows more alpha particles to escape, relative to an ideal spherical implosion, thus reducing alpha-energy deposition in the hot spot. Here, we extend previous ignition theory to include the hot-spot shape and quantify the effects of implosion asymmetry on both the ignition criterion and the capsule performance. The ignition criterion becomes more stringent with increasing deformation of the hot spot. The new theoretical results are validated by comparison with existing experimental data obtained at the National Ignition Facility. The shape effects on thermonuclear performance are relatively more noticeable for capsules having self-heating and high yields. As a result, the degradation of thermonuclear burn can be as high as 45% for shots with a yield lower than 2 × 10 15 and less than 30% for shots with a higher yield.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [2];  [1];  [2]; ORCiD logo [1];  [1]
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  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1480029
Alternate Identifier(s):
OSTI ID: 1464320
Report Number(s):
LA-UR-18-23151
Journal ID: ISSN 2470-0045; PLEEE8
Grant/Contract Number:  
AC52-06NA25396; W-7405-ENG-36
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review E
Additional Journal Information:
Journal Volume: 98; Journal Issue: 2; Journal ID: ISSN 2470-0045
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Cheng, Baolian, Kwan, Thomas J. T., Yi, S. A., Landen, Otto L., Wang, Yi -Ming, Cerjan, Charlie J., Batha, Steven H., and Wysocki, Fred J. Effects of asymmetry and hot-spot shape on ignition capsules. United States: N. p., 2018. Web. doi:10.1103/PhysRevE.98.023203.
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Cheng, Baolian, Kwan, Thomas J. T., Yi, S. A., Landen, Otto L., Wang, Yi -Ming, Cerjan, Charlie J., Batha, Steven H., & Wysocki, Fred J. Effects of asymmetry and hot-spot shape on ignition capsules. United States. doi:10.1103/PhysRevE.98.023203.
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Cheng, Baolian, Kwan, Thomas J. T., Yi, S. A., Landen, Otto L., Wang, Yi -Ming, Cerjan, Charlie J., Batha, Steven H., and Wysocki, Fred J. Mon . "Effects of asymmetry and hot-spot shape on ignition capsules". United States. doi:10.1103/PhysRevE.98.023203. https://www.osti.gov/servlets/purl/1480029.
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@article{osti_1480029,
title = {Effects of asymmetry and hot-spot shape on ignition capsules},
author = {Cheng, Baolian and Kwan, Thomas J. T. and Yi, S. A. and Landen, Otto L. and Wang, Yi -Ming and Cerjan, Charlie J. and Batha, Steven H. and Wysocki, Fred J.},
abstractNote = {Asymmetric implosion of inertial confinement fusion capsules is known, both experimentally and computationally, to reduce thermonuclear performance. This work shows that low-mode asymmetries degrade performance as a result of a decrease in the hydrodynamic disassembly time of the hot-spot core, which scales with the minimum dimension of the hot spot. The asymmetric shape of a hot spot results in decreased temperatures and areal densities and allows more alpha particles to escape, relative to an ideal spherical implosion, thus reducing alpha-energy deposition in the hot spot. Here, we extend previous ignition theory to include the hot-spot shape and quantify the effects of implosion asymmetry on both the ignition criterion and the capsule performance. The ignition criterion becomes more stringent with increasing deformation of the hot spot. The new theoretical results are validated by comparison with existing experimental data obtained at the National Ignition Facility. The shape effects on thermonuclear performance are relatively more noticeable for capsules having self-heating and high yields. As a result, the degradation of thermonuclear burn can be as high as 45% for shots with a yield lower than 2 × 1015 and less than 30% for shots with a higher yield.},
doi = {10.1103/PhysRevE.98.023203},
journal = {Physical Review E},
number = 2,
volume = 98,
place = {United States},
year = {2018},
month = {8}
}
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DOI:  10.1103/PhysRevE.98.023203
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