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Title: Temperature anisotropy relaxation of the one-component plasma

Abstract

The relaxation rate of a Maxwellian velocity distribution function that has an initially anisotropic temperature (T ≠ T ) is an important physical process in space and laboratory plasmas. It is also a canonical example of an energy transport process that can be used to test theory. Here, this rate is evaluated using molecular dynamics simulations of the one-component plasma. Results are compared with the predictions of four kinetic theories; two treating the weakly coupled regime (1) the Landau equation, and (2) the Lenard-Balescu equation, and two that attempt to extend the theory into the strongly coupled regime (3) the effective potential theory and (4) the generalized Lenard-Balescu theory. The role of dynamic screening is studied, and is found to have a negligible influence on this transport rate. Oscillations and a delayed relaxation onset in the temperature profiles are observed at strong coupling, which are not described by the kinetic theories.

Authors:
 [1];  [2]
  1. Univ. of Iowa, Iowa City, IA (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:
1463541
Alternate Identifier(s):
OSTI ID: 1374761
Report Number(s):
LA-UR-17-22873
Journal ID: ISSN 0863-1042
Grant/Contract Number:  
AC52-06NA25396; 20150520ER
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Contributions to Plasma Physics
Additional Journal Information:
Journal Volume: 57; Journal Issue: 6-7; Journal ID: ISSN 0863-1042
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Baalrud, Scott D., and Daligault, Jerome. Temperature anisotropy relaxation of the one-component plasma. United States: N. p., 2017. Web. doi:10.1002/ctpp.201700028.
Baalrud, Scott D., & Daligault, Jerome. Temperature anisotropy relaxation of the one-component plasma. United States. doi:10.1002/ctpp.201700028.
Baalrud, Scott D., and Daligault, Jerome. Fri . "Temperature anisotropy relaxation of the one-component plasma". United States. doi:10.1002/ctpp.201700028. https://www.osti.gov/servlets/purl/1463541.
@article{osti_1463541,
title = {Temperature anisotropy relaxation of the one-component plasma},
author = {Baalrud, Scott D. and Daligault, Jerome},
abstractNote = {The relaxation rate of a Maxwellian velocity distribution function that has an initially anisotropic temperature (T∥ ≠ T⟂) is an important physical process in space and laboratory plasmas. It is also a canonical example of an energy transport process that can be used to test theory. Here, this rate is evaluated using molecular dynamics simulations of the one-component plasma. Results are compared with the predictions of four kinetic theories; two treating the weakly coupled regime (1) the Landau equation, and (2) the Lenard-Balescu equation, and two that attempt to extend the theory into the strongly coupled regime (3) the effective potential theory and (4) the generalized Lenard-Balescu theory. The role of dynamic screening is studied, and is found to have a negligible influence on this transport rate. Oscillations and a delayed relaxation onset in the temperature profiles are observed at strong coupling, which are not described by the kinetic theories.},
doi = {10.1002/ctpp.201700028},
journal = {Contributions to Plasma Physics},
number = 6-7,
volume = 57,
place = {United States},
year = {Fri Jun 02 00:00:00 EDT 2017},
month = {Fri Jun 02 00:00:00 EDT 2017}
}

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