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Nonlinear Landau damping rate of a driven plasma wave
Didier Bénisti1, David J Strozzi, Laurent Gremillet
1CEA, DAM, DIF 91297 Arpajon Cedex, France. didier.benisti@cea.fr
Abstract:
In this Letter, we discuss the concept of the nonlinear Landau damping rate, nu, of a driven electron plasma wave, and provide a very simple, practical formula for nu, which agrees very well with results inferred from Vlasov simulations of stimulated Raman scattering. nu actually is more complicated an operator than a plain damping rate, and it may only be seen as such because it assumes almost constant values before abruptly dropping to 0. The decrease of nu to 0 is moreover shown to occur later when the wave amplitude varies in the direction transverse to its propagation.
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