Plasma-maser effect and evolution of resonant waves in turbulent plasmas

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Abstract
The evolution of resonant waves due to the nonlinear interaction associated with the plasma-maser effect is considered, and the nonlinear growth rate obtained. It is shown that the latter contains a "polarization" (only for the resonant waves) as well as a "direct third-order" contribution. In particular, the effect of the plasma-maser mechanism on the beam instability caused by Landau growth is investigated. It is shown that this effect can significantly modify the behavior of the instability. The conditions for the dominance of the plasma-maser effect nonlinearity over that of the usual quasilinear mechanism are given.