Self-consistency vanishes in the plateau regime of the bump-on-tail instability

Details Self-consistency vanishes in the plateau regime of the bump-on-tail instability Self-consistency vanishes in the plateau regime of the bump-on-tail instability

2008-07-11

arxiv.org/abs/0807.1839v1

Physics

Plasma Physics

Scientific paper

Using the Vlasov-wave formalism, it is shown that self-consistency vanishes in the plateau regime of the bump-on-tail instability if the plateau is broad enough. This shows that, in contrast with the "turbulent trapping" Ansatz, a renormalization of the Landau growth rate or of the quasilinear diffusion coefficient is not necessarily related to the limit where the Landau growth time becomes large with respect to the time of spreading of the particle positions due to velocity diffusion.

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