Effects of asymmetry and hot-spot shape on ignition capsules

Cheng, Baolian; Kwan, Thomas J. T.; Yi, S. A.; Landen, Otto L.; Wang, Yi -Ming; Cerjan, Charlie J.; Batha, Steven H.; Wysocki, Fred J.

doi:10.1103/PhysRevE.98.023203

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

Journal Article · 13 August 2018 · Physical Review E

DOI: https://doi.org/10.1103/PhysRevE.98.023203 · OSTI ID:1480029

^[1];

^[1]; Landen, Otto L. ^[2]; Wang, Yi -Ming ^[1]; Cerjan, Charlie J. ^[2];

^[1]; Wysocki, Fred J. ^[1]

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

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.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-06NA25396; W-7405-ENG-36

OSTI ID:: 1480029

Report Number(s):: LA-UR--18-23151

Journal Information:: Physical Review E, Journal Name: Physical Review E Journal Issue: 2 Vol. 98; ISSN PLEEE8; ISSN 2470-0045

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited By (2)

A theoretical model for low-mode asymmetries in ICF implosions Zhang, Cunbo; Yu, Chengxin; Yang, Chen Physics of Plasmas, Vol. 26, Issue 2 https://doi.org/10.1063/1.5082586	journal	February 2019
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