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Title: Correlation and transport properties for mixtures at constant pressure and temperature

Abstract

Transport properties of mixtures of elements in the dense plasma regime play an important role in natural astrophysical and experimental systems, e.g., inertial confinement fusion. In this paper, we present a series of orbital-free molecular dynamics simulations on dense plasma mixtures with comparison to a global pseudo ion in jellium model. Hydrogen is mixed with elements of increasingly high atomic number (lithium, carbon, aluminum, copper, and silver) at a fixed temperature of 100 eV and constant pressure set by pure hydrogen at 2g/cm 3, namely, 370 Mbars. We compute ionic transport coefficients, such as self-diffusion, mutual diffusion, and viscosity for various concentrations. Small concentrations of the heavy atoms significantly change the density of the plasma and decrease the transport coefficients. The structure of the mixture evidences a strong Coulomb coupling between heavy ions and the appearance of a broad correlation peak at short distances between hydrogen atoms. Finally, the concept of an effective one component plasma is used to quantify the overcorrelation of the light element induced by the admixture of a heavy element.

Authors:
 [1];  [1];  [1];  [1];  [2];  [2];  [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Alternative Energies and Atomic Energy Commission (CEA), Arpajon (France)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Alternative Energies and Atomic Energy Commission (CEA), Arpajon (France)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); Alternative Energies and Atomic Energy Commission (CEA) (France)
OSTI Identifier:
1415398
Report Number(s):
LA-UR-17-24642
Journal ID: ISSN 2470-0045
Grant/Contract Number:
AC52-06NA25396; P184
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review E
Additional Journal Information:
Journal Volume: 95; Journal Issue: 6; Journal ID: ISSN 2470-0045
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; dense plasma focus; plasma transport; core of giant planets; inertially confined plasmas; warm-dense matter; first-principles calculations in plasma physics; Fokker-Planck & Vlasov model; hybrid model; molecular dynamics

Citation Formats

White, Alexander J., Collins, Lee A., Kress, Joel D., Ticknor, Christopher, Clérouin, Jean, Arnault, Philippe, and Desbiens, Nicolas. Correlation and transport properties for mixtures at constant pressure and temperature. United States: N. p., 2017. Web. doi:10.1103/PhysRevE.95.063202.
White, Alexander J., Collins, Lee A., Kress, Joel D., Ticknor, Christopher, Clérouin, Jean, Arnault, Philippe, & Desbiens, Nicolas. Correlation and transport properties for mixtures at constant pressure and temperature. United States. doi:10.1103/PhysRevE.95.063202.
White, Alexander J., Collins, Lee A., Kress, Joel D., Ticknor, Christopher, Clérouin, Jean, Arnault, Philippe, and Desbiens, Nicolas. 2017. "Correlation and transport properties for mixtures at constant pressure and temperature". United States. doi:10.1103/PhysRevE.95.063202.
@article{osti_1415398,
title = {Correlation and transport properties for mixtures at constant pressure and temperature},
author = {White, Alexander J. and Collins, Lee A. and Kress, Joel D. and Ticknor, Christopher and Clérouin, Jean and Arnault, Philippe and Desbiens, Nicolas},
abstractNote = {Transport properties of mixtures of elements in the dense plasma regime play an important role in natural astrophysical and experimental systems, e.g., inertial confinement fusion. In this paper, we present a series of orbital-free molecular dynamics simulations on dense plasma mixtures with comparison to a global pseudo ion in jellium model. Hydrogen is mixed with elements of increasingly high atomic number (lithium, carbon, aluminum, copper, and silver) at a fixed temperature of 100 eV and constant pressure set by pure hydrogen at 2g/cm3, namely, 370 Mbars. We compute ionic transport coefficients, such as self-diffusion, mutual diffusion, and viscosity for various concentrations. Small concentrations of the heavy atoms significantly change the density of the plasma and decrease the transport coefficients. The structure of the mixture evidences a strong Coulomb coupling between heavy ions and the appearance of a broad correlation peak at short distances between hydrogen atoms. Finally, the concept of an effective one component plasma is used to quantify the overcorrelation of the light element induced by the admixture of a heavy element.},
doi = {10.1103/PhysRevE.95.063202},
journal = {Physical Review E},
number = 6,
volume = 95,
place = {United States},
year = 2017,
month = 6
}

Journal Article:
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