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

Journal Article · Sun Jul 15 00:00:00 EDT 2007 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.2749715· OSTI ID:20975170

Albrecht-Marc, M; Ghizzo, A; Johnston, T W; Reveille, T; Del Sarto, D; Bertrand, P ^[1]

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1. L.P.M.I.A. UMR 7040, Universite Henri Poincare, BP 239 54506 Vandoeuvre les Nancy, Cedex France (France)

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.

• OSTI ID: 20975170
• Journal Information: Physics of Plasmas, Vol. 14, Issue 7; Other Information: DOI: 10.1063/1.2749715; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BACKSCATTERING
BERNSTEIN MODE
BOLTZMANN-VLASOV EQUATION
DISPERSION RELATIONS
LAGRANGIAN FUNCTION
MAXWELL EQUATIONS
NONLINEAR PROBLEMS
PHASE SPACE
PLASMA
PLASMA SIMULATION
PLASMA WAVES
RAMAN EFFECT
RESONANCE
STRONTIUM SULFIDES
TRAPPED ELECTRONS
TURBULENCE
VORTICES