Stimulated Brillouin backscattering and ion acoustic wave secondary instability
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551 (United States)
- Centre de Physique Theorique, Ecole Polytechnique, CNRS, 91128 Palaiseau Cedex (France)
- PAPD/LULI, Universite Paris 6, CNRS, CEA, Ecole Polytechnique, 3 rue Galilee, 94200 Ivry-sur-Seine (France)
A study of the secondary instability of a finite-amplitude ion acoustic wave (IAW) affecting the saturation of stimulated Brillouin backscattering (SBS) of laser light in a plasma is presented. The secondary instability of the SBS IAW provides a nonlinear dissipation mechanism for the SBS IAW and can reduce the SBS reflectivity. To better understand the physics of the secondary instability and SBS, particle-in-cell kinetic simulations, analysis of dispersion relations, and integration of coupled mode equations have been undertaken and compared. Among the effects examined are the influences on the secondary instability of the frequency of the primary IAW, the second-harmonic IAW, and ion trapping in the primary SBS IAW which affects Landau damping and the IAW frequency.
- OSTI ID:
- 21274184
- Journal Information:
- Physics of Plasmas, Vol. 16, Issue 3; Other Information: DOI: 10.1063/1.3086860; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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