Absolute instability of stimulated Brillouin scattering in drifting plasmas

Journal Article · Fri Jan 01 04:00:00 EST 1982 · Phys. Fluids; (United States)

DOI:https://doi.org/10.1063/1.863616· OSTI ID:6005662

Johnston, T W; Mitchel, G R; Grek, B

Absolute instability analysis of the coupled modes for stimulated Brillouin scattering for plasmas drifting at velocities rather greater than Mach 0.5 shows that oblique forward scatter is favored rather than backscatter, which is generally stable. For typical laser-target interaction parameters, a threshold (Ilambda/sup 2/) near 2 x 10/sup 15/ W cm/sup -2/ ..mu..m/sup 2/ seems reasonable. Light is not lost by re-emission but only diverted to more oblique incident angles and red-shifted. In laser-produced plasmas, reflection near critical density is needed to see the effect. For any condition (including supersonic plasma) absolute instability can only produce red-shifted light.

• Research Organization: INRS-Energie, Varennes, Quebec, Canada, JOL 2PO
• OSTI ID: 6005662
• Journal Information: Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 25:1; ISSN PFLDA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700107* -- Fusion Energy-- Plasma Research-- Instabilities
ABSOLUTE INSTABILITIES
BRILLOUIN EFFECT
COHERENT SCATTERING
ELECTROMAGNETIC RADIATION
INSTABILITY
MACH NUMBER
PLASMA DRIFT
PLASMA INSTABILITY
RADIATIONS
RED SHIFT
SCATTERING
VELOCITY
VISIBLE RADIATION