The effects of convergence ratio on the implosion behavior of DT layered inertial confinement fusion capsules

Haines, Brian M.; Yi, S. A.; Olson, R. E.; Khan, S. F.; Kyrala, G. A.; Zylstra, A. B.; Bradley, P. A.; Peterson, R. R.; Kline, J. L.; Leeper, R. J.; Shah, R. C.

doi:10.1063/1.4993065

Title: The effects of convergence ratio on the implosion behavior of DT layered inertial confinement fusion capsules

Journal Article · Mon Jul 10 00:00:00 EDT 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4993065· OSTI ID:1374335

^[1]; Yi, S. A. ^[1]; Olson, R. E. ^[1]; Khan, S. F. ^[2]; Kyrala, G. A. ^[1];

^[1];

^[1]; Peterson, R. R. ^[1]; Kline, J. L. ^[1];

^[1]; Shah, R. C. ^[1]

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

The wetted foam capsule design for inertial confinement fusion capsules, which includes a foam layer wetted with deuterium-tritium liquid, enables layered capsule implosions with a wide range of hot-spot convergence ratios (CR) on the National Ignition Facility. In this paper, we present a full-scale wetted foam capsule design that demonstrates high gain in one-dimensional simulations. In these simulations, increasing the convergence ratio leads to an improved capsule yield due to higher hot-spot temperatures and increased fuel areal density. High-resolution two-dimensional simulations of this design are presented with detailed and well resolved models for the capsule fill tube, support tent, surface roughness, and predicted asymmetries in the x-ray drive. Our modeling of these asymmetries is validated by comparisons with available experimental data. In 2D simulations of the full-scale wetted foam capsule design, jetting caused by the fill tube is prevented by the expansion of the tungsten-doped shell layer due to preheat. While the impacts of surface roughness and predicted asymmetries in the x-ray drive are enhanced by convergence effects, likely underpredicted in 2D at high CR, simulations predict that the capsule is robust to these features. Nevertheless, the design is highly susceptible to the effects of the capsule support tent, which negates all of the one-dimensional benefits of increasing the convergence ratio. Indeed, when the support tent is included in simulations, the yield decreases as the convergence ratio is increased for CR > 20. Finally and nevertheless, the results suggest that the full-scale wetted foam design has the potential to outperform ice layer capsules given currently achievable levels of asymmetries when fielded at low convergence ratios (CR < 20).

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-06NA25396; AC52-07NA27344

OSTI ID:: 1374335

Alternate ID(s):: OSTI ID: 1368606; OSTI ID: 1781752

Report Number(s):: LA-UR-17-23609; LLNL-JRNL-820815

Journal Information:: Physics of Plasmas, Vol. 24, Issue 7; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 28 works

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Title: The effects of convergence ratio on the implosion behavior of DT layered inertial confinement fusion capsules

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Cited By (13)

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