Nonlinear nature of kinetic undamped waves induced by electrostatic turbulence in stimulated Raman backscattering*
Institut Jean Lamour-UMR 7168, University of
Lorraine, BP 239,
Vandoeuvre les Nancy,
Received in final form: 22 April 2014
Published online: 1 October 2014
The influence of low-frequency waves of kinetic nature induced by electron trapping in backward Stimulated Raman Scattering (SRS) is investigated. Semi-lagrangian Vlasov-Maxwell simulations are carried out not only for periodic boundary conditions but also in the case of an open plasma with parabolic shape, in optical mixing. We provide a numerical example of generation of KEEN (kinetic electrostatic electron nonlinear) waves nonlinearly induced from the SRS through a mechanism we first here elucidate. In particular we identify a process of backward scattering of the SRS probe light from the so generated KEEN waves, which may provide a mechanism for the possible experimental observation and measurement of such nonlinear structures.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2014