Effects of Coulomb coupling on stopping power and a link to macroscopic transport
Abstract
Molecular dynamics simulations are used to assess the influence of Coulomb coupling on the energy evolution of charged projectiles in the classical onecomponent plasma. The average projectile kinetic energy is found to decrease linearly with time when νa/ωp ≲102, where νa is the Coulomb collision frequency between the projectile and the medium, and xp is the plasma frequency. Stopping power is obtained from the slope of this curve. In comparison to the weakly coupled limit, strong Coulomb coupling causes the magnitude of the dimensionless stopping power, (a/kBT)dE/dx, to increase, the Bragg peak to shift to several times the plasma thermal speed, and for the stopping power curve to broaden substantially. The rate of change of the total projectile kinetic energy averaged over many independent simulations is shown to consist of two measurable components: a component associated with a onedimensional friction force and a thermal energy exchange rate. In the limit of a slow and massive projectile, these can be related to the macroscopic transport rates of selfdiffusion and temperature relaxation in the plasma. Simulation results are compared with available theoretical models for stopping power, selfdiffusion, and temperature relaxation.
 Authors:

 Univ. of Iowa, Iowa City, IA (United States)
 Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
 Publication Date:
 Research Org.:
 Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Iowa, Iowa City, IA (United States)
 Sponsoring Org.:
 USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Fusion Energy Sciences (FES)
 OSTI Identifier:
 1565900
 Alternate Identifier(s):
 OSTI ID: 1556811; OSTI ID: 1777878
 Report Number(s):
 LAUR1922415
Journal ID: ISSN 1070664X; TRN: US2000936
 Grant/Contract Number:
 89233218CNA000001; SC0016159
 Resource Type:
 Accepted Manuscript
 Journal Name:
 Physics of Plasmas
 Additional Journal Information:
 Journal Volume: 26; Journal Issue: 8; Journal ID: ISSN 1070664X
 Publisher:
 American Institute of Physics (AIP)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Molecular dynamics; Plasma collisions; Bragg peak; Diffusion; Stopping power
Citation Formats
Bernstein, David J., Baalrud, Scott D., and Daligault, Jérôme Olivier. Effects of Coulomb coupling on stopping power and a link to macroscopic transport. United States: N. p., 2019.
Web. doi:10.1063/1.5095419.
Bernstein, David J., Baalrud, Scott D., & Daligault, Jérôme Olivier. Effects of Coulomb coupling on stopping power and a link to macroscopic transport. United States. https://doi.org/10.1063/1.5095419
Bernstein, David J., Baalrud, Scott D., and Daligault, Jérôme Olivier. Mon .
"Effects of Coulomb coupling on stopping power and a link to macroscopic transport". United States. https://doi.org/10.1063/1.5095419. https://www.osti.gov/servlets/purl/1565900.
@article{osti_1565900,
title = {Effects of Coulomb coupling on stopping power and a link to macroscopic transport},
author = {Bernstein, David J. and Baalrud, Scott D. and Daligault, Jérôme Olivier},
abstractNote = {Molecular dynamics simulations are used to assess the influence of Coulomb coupling on the energy evolution of charged projectiles in the classical onecomponent plasma. The average projectile kinetic energy is found to decrease linearly with time when νa/ωp ≲102, where νa is the Coulomb collision frequency between the projectile and the medium, and xp is the plasma frequency. Stopping power is obtained from the slope of this curve. In comparison to the weakly coupled limit, strong Coulomb coupling causes the magnitude of the dimensionless stopping power, (a/kBT)dE/dx, to increase, the Bragg peak to shift to several times the plasma thermal speed, and for the stopping power curve to broaden substantially. The rate of change of the total projectile kinetic energy averaged over many independent simulations is shown to consist of two measurable components: a component associated with a onedimensional friction force and a thermal energy exchange rate. In the limit of a slow and massive projectile, these can be related to the macroscopic transport rates of selfdiffusion and temperature relaxation in the plasma. Simulation results are compared with available theoretical models for stopping power, selfdiffusion, and temperature relaxation.},
doi = {10.1063/1.5095419},
journal = {Physics of Plasmas},
number = 8,
volume = 26,
place = {United States},
year = {2019},
month = {8}
}
Web of Science
Figures / Tables:
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Figures / Tables found in this record: