Thermal transport modeling of laser-irradiated spheres

Ma, Kevin H.; Patel, Mehul V.; Sherlock, Mark; Farmer, William A.; Johnsen, Eric

doi:10.1063/5.0005552

Thermal transport modeling of laser-irradiated spheres

Journal Article · Mon Nov 14 00:00:00 EST 2022 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0005552· OSTI ID:1959465

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Univ. of Michigan, Ann Arbor, MI (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Thermal transport of uniformly laser-irradiated spheres of various materials is investigated computationally. One-dimensional simulations of low- to mid-Z materials (Be, Al, and Cu) are performed to evaluate the impact of nonlocal electron transport on experimental observables under laser intensities of relevance to direct-drive inertial confinement fusion. Here we compare thermal transport models of different levels of fidelity: flux-limited Spitzer–Harm diffusion, the Schurtz–Nicolai–Busquet (SNB) reduced-order nonlocal model, and a Fokker–Planck description. Spitzer–Harm diffusion with different flux-limiter factors are compared with different implementations of the SNB model in the HYDRA radiation hydrodynamics code. Under the conditions of interest, the peak heat flux in the thermal front with the SNB model shows good agreement with Fokker–Planck calculations, with the largest errors below 10% at 10¹⁵W/cm² laser intensity. From HYDRA-SNB simulations, two experimentally relevant effects are observed from nonlocal heat transport when compared to flux-limited Spitzer–Harm modeling: coronal temperatures are cooler due to reduced heat fluxes in the expanding plasma and (for mid-Z materials) x-ray emissions are enhanced due to preheating in the dense plasma.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

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

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1959465

Alternate ID(s):: OSTI ID: 1898191
OSTI ID: 1959529

Report Number(s):: LLNL-JRNL-800568; LLNL-JRNL-840081; 1003688

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 11 Vol. 29; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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