Nonlinear nature of kinetic undamped waves induced by electrostatic turbulence in stimulated Raman backscattering |
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Authors: | Alain Ghizzo Daniele Del Sarto |
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Institution: | 1. Institut Jean Lamour-UMR 7168, University of Lorraine, BP 239, 54506, Vandoeuvre les Nancy, France
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Abstract: | 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. |
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