Vlasov-Maxwell numerical simulations of large amplitude Langmuir wave dynamics

The classical problem of the nonlinear dynamics of one dimensional large Langmuir waves is investigated numerically in the framework of a kinetic model based on the Vlasov equations for plasma electrons and ions, coupled with the Maxwell equations. The field and plasma quantities are followed in time starting from a given spatial electric field distribution with typical scalelength much larger than the Debye length. The temporal evolution of the particle distribution functions and of its moments are investigated during the relaxation of the initial perturbation or under the action of an externally applied oscillating field. The transformation of ordered energy into electron temperature is observed. The frequency spectra of the electron and ion fluctuations are calculated and harmonic generation is studied.