Modification of stimulated Brillouin, saturated Raman scattering and strong Langmuir turbulence by nonlocal heat transport

Journal Article · Mon Jun 01 00:00:00 EDT 1992 · Physics of Fluids B; (United States)

DOI:https://doi.org/10.1063/1.860098· OSTI ID:7034197

Rose, H A; DuBois, D F ^[1]

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1. Theoretical Division, University of California, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

The linear instability analysis of stimulated Brillouin backscatter (SBS) is revisited to study the effect of nonlocal electron heat transport that enhances the density modulation over that caused by the ponderomotive pressure. It is found that the intensity threshold is lowered by a factor of roughly the inverse of 1+1000 ({ital n}{sub {ital e}}/{ital n}{sub {ital c}})ln {Lambda}({ital Z}{sup 3/2}/{ital T}{sub eV}{sup 2})/{lambda}{sub {mu}}, where {ital T}{sub eV} is the electron temperature in eV and {lambda}{sub {mu}} is the laser wavelength in microns, provided that {lambda}{sub {mu}}{ital T}{sub eV}{sup 2}({ital n}{sub {ital c}}/{ital n}{sub {ital e}}){much gt}50 ln {Lambda}{radical}{ital Z}. A similar reduction in the threshold for Langmuir decay is found, which, in the case of stimulated Raman scattering (SRS), may lead to a reduced saturation level for SRS.

• OSTI ID: 7034197
• Journal Information: Physics of Fluids B; (United States), Vol. 4:6; ISSN 0899-8221
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
PLASMA INSTABILITY
BRILLOUIN EFFECT
RAMAN EFFECT
ELECTRON TEMPERATURE
ION ACOUSTIC WAVES
LASER-PRODUCED PLASMA
SCATTERING
TRANSPORT THEORY
TURBULENCE
COHERENT SCATTERING
INSTABILITY
ION WAVES
PLASMA
PLASMA WAVES
700350* - Plasma Production
Heating
Current Drive
& Interactions- (1992-)
700330 - Plasma Kinetics
Transport
& Impurities- (1992-)