The effect of induced spatial incoherence on the absolute Raman instability

Journal Article · Fri Mar 01 04:00:00 EST 1991 · Physics of Fluids B; (USA)

DOI:https://doi.org/10.1063/1.859873· OSTI ID:5710603

Guzdar, P N; Tan, W; Lee, Y C; Liu, C S ^[1]; Lehmberg, R H ^[2]

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1. Laboratory for Plasma Research, University of Maryland, College Park, Maryland 20742-3511 (US)
2. Naval Research Laboratory, Washington, D.C. 20375-5000 (USA)

A numerical and analytical study of the Raman instability in a homogeneous plasma is presented in which the pump has been modeled to include the effects of broad bandwidth and the induced spatial incoherence (ISI) method of beam smoothing. For a time-averaged homogeneous growth rate {bar {gamma}}{sub 0} and a bandwidth {sigma}, there is a significant reduction in Raman backscattering when {sigma}{approx gt}2{gamma}{sub 0}, for {bar {gamma}}{sup 2}{sub 0} near threshold intensity. However, for {bar {gamma}}{sup 2}{sub 0} very large compared to the threshold, neither ISI nor bandwidth affects Raman scattering.

• OSTI ID: 5710603
• Journal Information: Physics of Fluids B; (USA), Journal Name: Physics of Fluids B; (USA) Vol. 3:3; ISSN 0899-8221; ISSN PFBPE
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700107 -- Fusion Energy-- Plasma Research-- Instabilities
700108* -- Fusion Energy-- Plasma Research-- Wave Phenomena
ABSOLUTE INSTABILITIES
ANALYTICAL SOLUTION
BACKSCATTERING
ENERGY
HOMOGENEOUS PLASMA
INHIBITION
INSTABILITY
INTERFERENCE
NUMERICAL SOLUTION
PLASMA
PLASMA INSTABILITY
RAMAN EFFECT
SCATTERING
THRESHOLD ENERGY