Title: A kinetic model of friction in strongly coupled strongly magnetized plasmas

Abstract

Plasmas that are strongly magnetized in the sense that the gyrofrequency exceeds the plasma frequency exhibit novel transport properties that are not well understood. As a representative example, we compute the friction force acting on a massive test charge moving through a strongly coupled and strongly magnetized one-component plasma using a generalized Boltzmann kinetic theory. Recent works studying the weakly coupled regime have shown that strong magnetization leads to a transverse component of the friction force that is perpendicular to both the Lorentz force and velocity of the test charge, in addition to the stopping power component aligned antiparallel to the velocity. Recent molecular dynamics simulations have also shown that strong Coulomb coupling in addition to strong magnetization gives rise to a third component of the friction force in the direction of the Lorentz force. Here, we show that the generalized Boltzmann kinetic theory captures these effects and generally agrees well with the molecular dynamics simulations over a broad range of Coulomb coupling and magnetization strength regimes. The theory is also used to show that the “gyro” component of the friction in the direction of the Lorentz force arises due to asymmetries associated with gyromotion during short-range collisions. Computing themore » average motion of the test charge through the background plasma, the transverse force is found to strongly influence the trajectory by changing the gyroradius and the gyrofriction force is found to slightly change the gyrofrequency of the test charge resulting in a phase shift.« less

Authors:

Jose, Louis  ^[1];

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• Search DOE PAGES for ORCID "0000-0002-8495-5095"

Baalrud, Scott D.  ^[1]

• Search DOE PAGES for author "Baalrud, Scott D."
• Search DOE PAGES for ORCID "0000-0001-9641-2605"

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1. Univ. of Michigan, Ann Arbor, MI (United States)

Publication Date:

Mon Jul 19 00:00:00 EDT 2021

Research Org.:

Univ. of Iowa, Iowa City, IA (United States)

Sponsoring Org.:

USDOE Office of Science (SC), Fusion Energy Sciences (FES)

OSTI Identifier:

1855776

Alternate Identifier(s):

OSTI ID: 1808624

Grant/Contract Number:  

SC0016159

Resource Type:

Accepted Manuscript

Journal Name:

Physics of Plasmas

Additional Journal Information:

Journal Volume: 28; Journal Issue: 7; Journal ID: ISSN 1070-664X

Publisher:

American Institute of Physics (AIP)

Country of Publication:

United States

Language:

English

Subject:

70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Maxwell-Boltzmann distribution; Kinetic theory; Molecular dynamics; Bragg peak; Nonequilibrium statistical mechanics; Electrostatics; Linear response; Plasmas; Transport properties