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Title: Saturation mechanisms of backward stimulated Raman scattering in a one-dimensional geometry

In this paper, we investigate the saturation mechanisms of backward stimulated Raman scattering (BSRS) induced by nonlinear kinetic effects. In particular, we stress the importance of accounting for both the nonlinear frequency shift of the electron plasma wave and the growth of sidebands, in order to understand what stops the coherent growth of Raman scattering. Using a Bernstein-Greene-Kruskal approach, we provide an estimate for the maximum amplitude reached by a BSRS-driven plasma wave after the phase of monotonic growth. This estimate is in very good agreement with the results from kinetic simulations of stimulated Raman scattering using both a Vlasov and a Particle in Cell code. Our analysis, which may be generalized to a multidimensional geometry, should provide a means to estimate the limits of backward Raman amplification or the effectiveness of strategies that aim at strongly reducing Raman reflectivity in a fusion plasma.
Authors:
; ; ; ;  [1] ;  [2] ;  [3]
  1. CEA, DAM, DIF, F-91297 Arpajon (France)
  2. Max Planck Institute for the Physics of Complex Systems, D-01187 Dresden (Germany)
  3. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
Publication Date:
OSTI Identifier:
22218548
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 10; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AMPLIFICATION; AMPLITUDES; BOLTZMANN-VLASOV EQUATION; ELECTRON PLASMA WAVES; NONLINEAR PROBLEMS; ONE-DIMENSIONAL CALCULATIONS; PLASMA SIMULATION; RAMAN EFFECT; REFLECTIVITY; STRESSES; THERMONUCLEAR REACTIONS