Abstract
This paper presents a “hybrid” method of numerical simulation of collisionless plasmas in which weighted particles are advanced as in particle simulations, but in which the distribution function is reconstructed periodically by a local averaging operation as in numerical solutions of the Vlasov equation. The rates of diffusion resulting from repeated averaging of the distribution function are estimated. These rates indicate that it is possible to minimize the effects of both beaming instabilities and diffusion by properly choosing the frequency of reconstruction of the distribution function. A computer code was written to implement this method and numerical solutions of two-stream instability problems are presented.
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