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Saturation process induced by vortex-merging in numerical Vlasov-Maxwell experiments of stimulated Raman backscattering

Abstract : The influence of low-frequency nonlinear Bernstein-Greene-Kruskal (BGK)-type waves induced by trapped electrons in backward stimulated Raman scattering is investigated in optical mixing. Semi-Lagrangian Vlasov-Maxwell simulations show two nonlinear behaviors. First, there is a Morales-O’Neil plasma wave frequency downshift retuned by a small wavenumber shift which maintains the Stimulated Raman Scattering (SRS) resonance. The saturation of Raman backscattering begins with phase space vortex merging followed by a transition to lower wavenumbers following the (nonlinear) dispersion relation, resembling weak turbulence.
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https://hal.univ-lorraine.fr/hal-01804605
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M. Albrecht-Marc, A. Ghizzo, T. Johnston, T. Reveille, D. del Sarto, et al.. Saturation process induced by vortex-merging in numerical Vlasov-Maxwell experiments of stimulated Raman backscattering. Physics of Plasmas, American Institute of Physics, 2007, 14 (7), pp.072704. ⟨10.1063/1.2749715⟩. ⟨hal-01804605⟩

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