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

Journal Article · Tue Oct 15 04:00:00 EDT 2013 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4823714· OSTI ID:22218548

Friou, A.; Bénisti, D.; Gremillet, L.; Lefebvre, E.; Morice, O. ^[1]; Siminos, E. ^[2]; Strozzi, D. J. ^[3]

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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)

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.

• OSTI ID: 22218548
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 10 Vol. 20; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

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