Numerical investigation of nonequilibrium electron effects on the collisional ionization rate in the collisional-radiative model

Cho, M. S.; Chung, H. -K.; Foord, M. E.; Libby, S. B.; Cho, B. I.

doi:10.1103/physreve.109.045207

Title: Numerical investigation of nonequilibrium electron effects on the collisional ionization rate in the collisional-radiative model

Journal Article · 17 April 2024 · Physical Review. E

DOI: https://doi.org/10.1103/physreve.109.045207 · OSTI ID:2396425

^[1]; Chung, H. -K. ^[2]; Foord, M. E. ^[3];

^[3]; Cho, B. I. ^[4]

Gwangju Inst. of Science and Technology (Korea, Republic of); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Korea Institute of Fusion Energy, Daejeon (Korea, Republic of)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Gwangju Inst. of Science and Technology (Korea, Republic of)

In this study, the interplay of kinetic electron physics and atomic processes in ultrashort laser-plasma interactions provides a comprehensive understanding of the impact of the electron energy distribution on plasma properties. Notably, nonequilibrium electrons play a vital role in collisional ionization, influencing ionization degrees and spectra. This paper introduces a computational model that integrates the physics of kinetic electrons and atomic processes, utilizing a Boltzmann equation for nonequilibrium electrons and a collisional-radiative model for atomic state populations. The model is used to investigate the influence of nonequilibrium electrons on collisional ionization rates and its effect on the population distribution, as observed in a widely known experiment. The study reveals a significant nonequilibrium electron presence during XFEL-matter interactions, profoundly affecting collisional ionization rates in the gas plasma, thereby necessitating careful consideration of the Collisional-Radiative model applied to such systems.

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); National Research Foundation of Korea (NRF)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 2396425

Report Number(s):: LLNL--JRNL-857133; 1086917

Journal Information:: Physical Review. E, Journal Name: Physical Review. E Journal Issue: 4 Vol. 109; ISSN 2470-0045

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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