Linear theory of electron-plasma waves at arbitrary collisionality
Name
1811.12855.pdf
Description
Accepted version
Size
1.95 MB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Jorge, R.
Ricci, P.
Brunner, S.
Gamba, S.
Konovets, V.
Gomes Loureiro, Nuno F
Perrone, L. M.
Teixeira, N.
Date Issued
April 2019
Journal
Journal of Plasma Physics
Publisher
Cambridge University Press (CUP)
Citation
Jorge, R., et al. “Linear Theory of Electron-Plasma Waves at Arbitrary Collisionality.” Journal of Plasma Physics 85, 2 (2019): no. 905850211 doi: 10.1017/S0022377819000266 ©2019 Author(s)
Version
Author's final manuscript
Abstract
The dynamics of electron-plasma waves is 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. ©2019 Keywords: plasma waves
MIT Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
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DOI of Published Version
https://doi.org/10.1017/S0022377819000266
