Nonlinear saturation of stimulated Raman scattering in collisional homogeneous plasma

Conference · Sun Jan 01 04:00:00 EST 1984

OSTI ID:6171037

McKinstrie, C J; Simon, A

Using multiple time scale analysis we have extended a previous threshold calculation of nonlinear saturation of the SRS instability in collisional homogeneous plasma. This purely temporal problem, with a ubiquitous driver and arbitrary damping for each wave, is solved for incident pump amplitudes exceeding threshold by the factor m (where m can be much larger than unity). We obtain new expressions for the saturated amplitude of each wave and demonstrate that the nonlinear frequency shift vanishes. The reflection coefficient is (..cap omega../sub 2//..cap omega../sub 1/)/sup 3/(1-1/m) where ..cap omega../sub 1/ and ..cap omega../sub 2/ are the frequencies of the incident and scattered e.m. waves. A formula which includes the effect of mismatch is also given. With only one wave damped the reflection coefficient is (..cap omega../sub 2//..cap omega../sub 1/). This difference can be understood by a simple energy argument. We also show that the complete time dependence can be obtained in the threshold regime (m-1<<1).

• Research Organization: Rochester Univ., NY (USA). Lab. for Laser Energetics
• DOE Contract Number: AC08-80DP40124
• OSTI ID: 6171037
• Report Number(s): DOE/DP/40124-54; CONF-841010-6; ON: DE85002814
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700208* -- Fusion Power Plant Technology-- Inertial Confinement Technology
BACKSCATTERING
COLLISIONAL PLASMA
HOMOGENEOUS PLASMA
LASER-PRODUCED PLASMA
NONLINEAR PROBLEMS
PLASMA
RAMAN EFFECT
SCATTERING