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Title: Mean-force scattering potential for calculating optical properties of dense plasmas

Abstract

Here, we assess the relative importance of ionic structure on the opacity of dense plasmas by using the potential of mean force as a scattering potential within the Kubo-Greenwood formalism. We compare results from the potential of mean force, which includes realistic ionic structure, to results using an average atom potential, which includes only a crude treatment of ionic structure. Comparisons with less approximate but more expensive DFT-MD simulations for aluminum plasma reveal that the mean force generally improves agreement for DC conductivity. We also see improvement when applying the mean force to free-free transitions, whereas for bound-bound and bound-free transitions the mean force leads to poorer agreement on transition energies. Further, we assess the impact of accounting for correlations within the plasma at the temperature and density conditions relevant to iron opacity measurements at Sandia’s Z machine facility and find that these correlations do not account for the discrepancy between the measurements and leading opacity calculations.

Authors:
ORCiD logo [1]; ORCiD logo [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Auburn Univ., Auburn, AL (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1494479
Report Number(s):
LA-UR-18-27960
Journal ID: ISSN 1574-1818
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
High Energy Density Physics
Additional Journal Information:
Journal Volume: 31; Journal Issue: C; Journal ID: ISSN 1574-1818
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ion correlations, mean force potential, average atom, opacity

Citation Formats

Gill, Nathanael Matthew, and Starrett, Charles Edward. Mean-force scattering potential for calculating optical properties of dense plasmas. United States: N. p., 2019. Web. doi:10.1016/j.hedp.2019.02.001.
Gill, Nathanael Matthew, & Starrett, Charles Edward. Mean-force scattering potential for calculating optical properties of dense plasmas. United States. doi:10.1016/j.hedp.2019.02.001.
Gill, Nathanael Matthew, and Starrett, Charles Edward. Fri . "Mean-force scattering potential for calculating optical properties of dense plasmas". United States. doi:10.1016/j.hedp.2019.02.001.
@article{osti_1494479,
title = {Mean-force scattering potential for calculating optical properties of dense plasmas},
author = {Gill, Nathanael Matthew and Starrett, Charles Edward},
abstractNote = {Here, we assess the relative importance of ionic structure on the opacity of dense plasmas by using the potential of mean force as a scattering potential within the Kubo-Greenwood formalism. We compare results from the potential of mean force, which includes realistic ionic structure, to results using an average atom potential, which includes only a crude treatment of ionic structure. Comparisons with less approximate but more expensive DFT-MD simulations for aluminum plasma reveal that the mean force generally improves agreement for DC conductivity. We also see improvement when applying the mean force to free-free transitions, whereas for bound-bound and bound-free transitions the mean force leads to poorer agreement on transition energies. Further, we assess the impact of accounting for correlations within the plasma at the temperature and density conditions relevant to iron opacity measurements at Sandia’s Z machine facility and find that these correlations do not account for the discrepancy between the measurements and leading opacity calculations.},
doi = {10.1016/j.hedp.2019.02.001},
journal = {High Energy Density Physics},
number = C,
volume = 31,
place = {United States},
year = {2019},
month = {2}
}

Journal Article:
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This content will become publicly available on February 1, 2020
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