Nonlinear evolution of stimulated Raman scattering in homogeneous plasmas
A model for stimulated Raman scattering (SRS) in a homogeneous plasma has been designed to account for the presence of stimulated Brillouin scattering (SBS) and the nonlinear coupling between Langmuir and ion waves described by Zakharov equations. The nonlinear evolution of electron plasma waves also includes an effective damping resulting from electron diffusion in localized Langmuir fields produced during simultaneous SRS and SBS evolutions. Numerical results based on this model show two distinct SRS behaviors. Close to n/sub cr//4 the Langmuir collapse dominates nonlinear evolution of the instability. At lower densities low level SRS is observed for a relatively long time after which SRS is terminated as a result of ion fluctuations produced by SBS. In addition, the anomalous absorption of backscattered SRS radiation by ion fluctuations produced by the collapse is proposed as a mechanism that may explain some recent experimental observations showing a gap in the SRS spectrum.
- Research Organization:
- Department of Physics, The University of Alberta, Edmonton, Alberta, T6G 2J1, Canada
- OSTI ID:
- 6489114
- Journal Information:
- Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 30:7; ISSN PFLDA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
700107* -- Fusion Energy-- Plasma Research-- Instabilities
BRILLOUIN EFFECT
COHERENT SCATTERING
COUPLING
DAMPING
DATA
ELECTRON DRIFT
ELECTRON PLASMA WAVES
EMISSION
ENERGY-LEVEL TRANSITIONS
HOMOGENEOUS PLASMA
HYDRODYNAMIC MODEL
INFORMATION
ION WAVES
MATHEMATICAL MODELS
NONLINEAR PROBLEMS
NUMERICAL DATA
PARTICLE MODELS
PLASMA
PLASMA WAVES
RAMAN EFFECT
SCATTERING
STATISTICAL MODELS
STIMULATED EMISSION
THERMODYNAMIC MODEL