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.
Domains
Physics [physics] Physics [physics] Plasma Physics [physics.plasm-ph] Physics [physics] Physics [physics] Space Physics [physics.space-ph] Physics [physics] Physics [physics] Fluid Dynamics [physics.flu-dyn] Physics [physics] Mathematical Physics [math-ph] Physics [physics] High Energy Physics - Theory [hep-th] Nonlinear Sciences [physics] Chaotic Dynamics [nlin.CD] Computer Science [cs] Distributed, Parallel, and Cluster Computing [cs.DC]
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