Jorge, RogérioRicci, PaoloBrunner, StephanGamba, S.Konovets, V.Loureiro, N. F.Perrone, L. M.Teixeira, N.2019-04-122019-04-122019-04-122019-04-0810.1017/S0022377819000266https://infoscience.epfl.ch/handle/20.500.14299/1560081811.12855The 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.CRPP_EDGEtext::journal::journal article::research article