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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]
+ Show Author Affiliations
  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 Laboratory (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; TRN: US1902312
Grant/Contract Number:  
AC52-06NA25396; 20150520ER
Resource Type:
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.
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Baalrud, Scott D., & Daligault, Jerome. Temperature anisotropy relaxation of the one-component plasma. United States. https://doi.org/10.1002/ctpp.201700028
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Baalrud, Scott D., and Daligault, Jerome. Fri . "Temperature anisotropy relaxation of the one-component plasma". United States. https://doi.org/10.1002/ctpp.201700028. https://www.osti.gov/servlets/purl/1463541.
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@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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Publisher's Version of Record
https://doi.org/10.1002/ctpp.201700028
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Works referenced in this record:

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    Works referencing / citing this record:

    Reduction of electron heating by magnetizing ultracold neutral plasma
    journal, January 2018

    • Tiwari, Sanat Kumar; Baalrud, Scott D.
    • Physics of Plasmas, Vol. 25, Issue 1
    • DOI: 10.1063/1.5013320

    Laser cooling of ions in a neutral plasma
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    • Langin, Thomas K.; Gorman, Grant M.; Killian, Thomas C.
    • Science, Vol. 363, Issue 6422
    • DOI: 10.1126/science.aat3158

    Exploring the crossover between high-energy-density plasma and ultracold neutral plasma physics
    journal, October 2019

    • Bergeson, Scott D.; Baalrud, Scott D.; Ellison, C. Leland
    • Physics of Plasmas, Vol. 26, Issue 10
    • DOI: 10.1063/1.5119144

    Reduction of electron heating by magnetizing ultracold neutral plasma
    text, January 2017

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