Pseudoatom molecular dynamics plasma microfields

White, Jackson Richard; Fontes, Christopher John; Zammit, Mark Christian; Gomez, T. A.; Starrett, Charles Edward

doi:10.1016/j.hedp.2025.101173

Pseudoatom molecular dynamics plasma microfields

Journal Article · Thu Jan 09 00:00:00 EST 2025 · High Energy Density Physics

DOI:https://doi.org/10.1016/j.hedp.2025.101173· OSTI ID:2500875

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Univ. of Texas, Austin, TX (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Univ. of Texas, Austin, TX (United States); Univ. of Colorado, Boulder, CO (United States)

Spectral lines are powerful diagnostic tools for both laboratory and astrophysical plasmas, as their shape is sensitive to the plasma environment. The low-frequency component of the electric microfield is an important input for semi-analytic line broadening codes. Here, in this paper, we detail a new method of calculating plasma microfields using configuration-resolved pseudoatom molecular dynamics. This approach accounts for both quantum atomic structure and N-body effects, similar to density functional theory molecular dynamics, but with less computational cost. We present pseudoatom microfields at plasma conditions relevant for recent high energy density laboratory astrophysics experiments conducted at the Sandia Z-Machine, National Ignition Facility, and Linac Coherent Light Source. Compared to established microfield codes we find moderate deviations at solid density conditions and strong agreement at lower plasma densities.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

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

Grant/Contract Number:: 89233218CNA000001; NA0003960; NA0004149

OSTI ID:: 2500875

Report Number(s):: LA-UR--24-27521

Journal Information:: High Energy Density Physics, Journal Name: High Energy Density Physics Vol. 54; ISSN 1574-1818

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Pseudoatom molecular dynamics plasma microfields

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