Saturation of stimulated Raman scattering by Langmuir and ion-acoustic wave coupling

Journal Article · Fri Jan 01 04:00:00 EST 1993 · Physics of Fluids B; (United States)

DOI:https://doi.org/10.1063/1.860861· OSTI ID:6829437

Kolber, T; Rozmus, W; Tikhonchuk, V T ^[1]

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1. Department of Physics, University of Alberta, Edmonton, Alberta, T6G 2J1 (Canada)

Studies of stimulated Raman scattering (SRS) based on the one-dimensional Zakharov--Maxwell equations for homogeneous, finite plasmas are presented for a wide range of parameters relevant to current laser--plasma interaction experiments. It was found that the primary mechanism responsible for saturation of SRS is the parametric decay instability (PDI) of the resonantly driven Langmuir wave. The different spatiotemporal evolution of SRS (convective) and PDI (absolute) leads to new physics in SRS nonlinear evolution, including disruption of PDI cascade, localization of Langmuir fields, and burstlike behavior of SRS reflectivity. The asymptotic saturation levels are well approximated by a simple scaling law, which is proportional to the PDI threshold and depends on the SRS convective gain factor.

• OSTI ID: 6829437
• Journal Information: Physics of Fluids B; (United States), Journal Name: Physics of Fluids B; (United States) Vol. 5:1; ISSN 0899-8221; ISSN PFBPEI
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700340* -- Plasma Waves
Oscillations
& Instabilities-- (1992-)
BEAM-PLASMA SYSTEMS
ION ACOUSTIC WAVES
ION WAVES
LASER-PRODUCED PLASMA
NUMERICAL SOLUTION
ONE-DIMENSIONAL CALCULATIONS
PLASMA
PLASMA WAVES
RAMAN EFFECT
SATURATION
SCALING LAWS
TURBULENCE
WAVE PROPAGATION