Influence of atomic kinetics on inverse bremsstrahlung heating and nonlocal thermal transport

Le, Hai P.; Sherlock, Mark; Scott, Howard A.

doi:10.1103/PhysRevE.100.013202

Title: Influence of atomic kinetics on inverse bremsstrahlung heating and nonlocal thermal transport

Journal Article · 08 July 2019 · Physical Review E

DOI: https://doi.org/10.1103/PhysRevE.100.013202 · OSTI ID:1532619

Le, Hai P. ^[1]; Sherlock, Mark ^[1]; Scott, Howard A. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

This paper describes a computational model that self-consistently combines physics of kinetic electrons and atomic processes in a single framework. The formulation consists of a kinetic Vlasov-Boltzmann-Fokker-Planck equation for free electrons and a non-Maxwellian collisional-radiative model for atomic state populations. We utilize this model to examine the influence of atomic kinetics on inverse bremsstrahlung (IB) heating and nonlocal thermal transport. Here, we show that atomic kinetics affects nonlinear IB absorption rates by further modifying the electron distribution in addition to laser heating. We also show that accurate modeling of nonlocal heat flow requires a self-consistent treatment of atomic kinetics, because the effective thermal conductivity strongly depends on the ionization balance of the plasma.

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

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

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1532619

Alternate ID(s):: OSTI ID: 1546375

Report Number(s):: LLNL-JRNL-773648; PLEEE8; 965657

Journal Information:: Physical Review E, Vol. 100, Issue 1; ISSN 2470-0045

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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