The bands method for tabulating NLTE material properties

Frank, Yechiel; Scott, Howard A.

doi:10.1016/j.hedp.2022.100998

The bands method for tabulating NLTE material properties

Journal Article · Fri Aug 05 00:00:00 EDT 2022 · High Energy Density Physics

DOI:https://doi.org/10.1016/j.hedp.2022.100998· OSTI ID:1883452

Frank, Yechiel ^[1]; ^[1]

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

The use of Non-Local Thermal Equilibrium (NLTE) material properties within radiation-hydrodynamic simulations remains a major challenge. The plasma radiative and EOS properties in NLTE can depend on the detailed local radiation field and electron energy distribution. Fully characterizing each of these quantities may require 10’s to 100’s of parameters, making tabulation effectively impossible and requiring expensive calculations for each set of conditions within the simulation. In this work we present a new method that characterizes the local radiation field with a limited number of parameters. Furthermore, this permits pre-calculation and tabulation of the material properties, allowing codes to perform NLTE radiation-hydrodynamic simulations which would otherwise be computationally prohibitive.

View Accepted Manuscript (DOE)

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:: 1883452

Report Number(s):: LLNL-JRNL-822417; 1034220

Journal Information:: High Energy Density Physics, Journal Name: High Energy Density Physics Vol. 43; ISSN 1574-1818

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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