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Collisional effects can play an essential role in the dynamics of plasmawaves by setting a minimum damping rate and by interfering with wave-particleresonances. Kinetic simulations of the effects of electron-ion pitch anglescattering on Electron Plasma Waves (EPWs) are presented here. In particular,the effects of such collisions on the frequency and damping of small-amplitudeEPWs for a range of collision rates and wave phase velocities are computed andcompared with theory. Both the Vlasov simulations and linear kinetic theoryfind the direct contribution of electron-ion collisions to wave damping isabout a factor of two smaller than is obtained from linearized fluid theory. Toour knowledge, this simple result has not been published before.  Simulations have been carried out using a grid-based (Vlasov) approach, basedon a high-order conservative finite difference method for discretizing theFokker-Planck equation describing the evolution of the electron distributionfunction. Details of the implementation of the collision operator within thisframework are presented. Such a grid-based approach, which is not subject tonumerical noise, is of particular interest for the accurate measurements of thewave damping rates.

Vlasov Simulations of Electron-Ion Collision Effects on Damping of Electron Plasma Waves