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Title: Linear Theory of Electron-Plasma Waves at Arbitrary Collisionality

Abstract

The dynamics of electron-plasma waves are described at arbitrary collisionality by considering the full Coulomb collision operator. The description is based on a Hermite- Laguerre decomposition of the velocity dependence of the electron distribution function. The damping rate, frequency, and eigenmode spectrum of electron-plasma waves are found as functions of the collision frequency and wavelength. A comparison is made between the collisionless Landau damping limit, the Lenard-Bernstein and Dougherty collision operators, and the electron-ion collision operator, finding large deviations in the damping rates and eigenmode spectra. A purely damped entropy mode, characteristic of a plasma where pitch-angle scattering effects are dominant with respect to collisionless effects, is shown to emerge numerically, and its dispersion relation is analytically derived. It is shown that such a mode is absent when simplified collision operators are used, and that like-particle collisions strongly influence the damping rate of the entropy mode.

Authors:
; ; ; ; ; ; ;
Publication Date:
DOE Contract Number:  
FG02-91ER54109
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1880321
DOI:
https://doi.org/10.7910/DVN/LOAT9C

Citation Formats

Jorge, R., Ricci, P., Brunner, S., Gamba, S., Konovets, V., Loureiro, N. F., Perrone, L. M., and Teixeira, N. Linear Theory of Electron-Plasma Waves at Arbitrary Collisionality. United States: N. p., 2018. Web. doi:10.7910/DVN/LOAT9C.
Jorge, R., Ricci, P., Brunner, S., Gamba, S., Konovets, V., Loureiro, N. F., Perrone, L. M., & Teixeira, N. Linear Theory of Electron-Plasma Waves at Arbitrary Collisionality. United States. doi:https://doi.org/10.7910/DVN/LOAT9C
Jorge, R., Ricci, P., Brunner, S., Gamba, S., Konovets, V., Loureiro, N. F., Perrone, L. M., and Teixeira, N. 2018. "Linear Theory of Electron-Plasma Waves at Arbitrary Collisionality". United States. doi:https://doi.org/10.7910/DVN/LOAT9C. https://www.osti.gov/servlets/purl/1880321. Pub date:Tue Dec 04 00:00:00 EST 2018
@article{osti_1880321,
title = {Linear Theory of Electron-Plasma Waves at Arbitrary Collisionality},
author = {Jorge, R. and Ricci, P. and Brunner, S. and Gamba, S. and Konovets, V. and Loureiro, N. F. and Perrone, L. M. and Teixeira, N.},
abstractNote = {The dynamics of electron-plasma waves are described at arbitrary collisionality by considering the full Coulomb collision operator. The description is based on a Hermite- Laguerre decomposition of the velocity dependence of the electron distribution function. The damping rate, frequency, and eigenmode spectrum of electron-plasma waves are found as functions of the collision frequency and wavelength. A comparison is made between the collisionless Landau damping limit, the Lenard-Bernstein and Dougherty collision operators, and the electron-ion collision operator, finding large deviations in the damping rates and eigenmode spectra. A purely damped entropy mode, characteristic of a plasma where pitch-angle scattering effects are dominant with respect to collisionless effects, is shown to emerge numerically, and its dispersion relation is analytically derived. It is shown that such a mode is absent when simplified collision operators are used, and that like-particle collisions strongly influence the damping rate of the entropy mode.},
doi = {10.7910/DVN/LOAT9C},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {12}
}

Works referencing / citing this record:

Linear theory of electron-plasma waves at arbitrary collisionality
journal, April 2019