10.7910/DVN/LOAT9CR. Jorge, P. Ricci, S. Brunner, S. Gamba, V. Konovets, N. F. Loureiro, L. M. Perrone, N. TeixeiraHarvard Dataverse2018PhysicsBoltzmann equationcollision operatorspolynomial expansionsspectrawaves2018-12-04987996application/pdf1.0The 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.<a href="http://library.psfc.mit.edu/catalog/reports/2010/18ja/18ja032/abstract.php">PSFC REPORT PSFC/JA-18-32</a><br /><br />N.F. Loureiro was partially funded by the U.S. Department of Energy Grant No. DE-FG02-91ER54109.