Influence of atomic kinetics on inverse bremsstrahlung heating and nonlocal thermal transport
Abstract
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.
- Authors:
-
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1532619
- Alternate Identifier(s):
- OSTI ID: 1546375
- Report Number(s):
- LLNL-JRNL-773648
Journal ID: ISSN 2470-0045; PLEEE8; 965657
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review E
- Additional Journal Information:
- Journal Volume: 100; Journal Issue: 1; Journal ID: ISSN 2470-0045
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 74 ATOMIC AND MOLECULAR PHYSICS
Citation Formats
Le, Hai P., Sherlock, Mark, and Scott, Howard A.. Influence of atomic kinetics on inverse bremsstrahlung heating and nonlocal thermal transport. United States: N. p., 2019.
Web. doi:10.1103/PhysRevE.100.013202.
Le, Hai P., Sherlock, Mark, & Scott, Howard A.. Influence of atomic kinetics on inverse bremsstrahlung heating and nonlocal thermal transport. United States. https://doi.org/10.1103/PhysRevE.100.013202
Le, Hai P., Sherlock, Mark, and Scott, Howard A.. Mon .
"Influence of atomic kinetics on inverse bremsstrahlung heating and nonlocal thermal transport". United States. https://doi.org/10.1103/PhysRevE.100.013202. https://www.osti.gov/servlets/purl/1532619.
@article{osti_1532619,
title = {Influence of atomic kinetics on inverse bremsstrahlung heating and nonlocal thermal transport},
author = {Le, Hai P. and Sherlock, Mark and Scott, Howard A.},
abstractNote = {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.},
doi = {10.1103/PhysRevE.100.013202},
journal = {Physical Review E},
number = 1,
volume = 100,
place = {United States},
year = {2019},
month = {7}
}
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Figures / Tables:
FIG. 1: Simulation of IB heating and ionization of Al at ni = 1019 cm−3. The plasma is initially in LTE at 2 ev. (a) Electron temperature, (b) charge state densities, (c) ionization state and (d) IB absorption coefficient are shown as functions of time. In (d), solid line refersmore »
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Investigation of picosecond thermodynamics in a laser-produced plasma using Thomson scattering
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Figures / Tables found in this record:
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