Measurements of strong stimulated Brillouin scattering in a microwave-plasma interaction experiment

Thesis/Dissertation · Sat Jan 01 00:00:00 EST 1983

OSTI ID:5801133

James, R A

Strong Stimulated Brillouin Scattering (SBS) is measured in the U.C. Davis CEREBERUS tank, a device that models SBS in laser driven pellets. A large diameter, semi-parallel 2.9-GHz microwave beam is normally incident onto an argon plasma. The plasma is essentially collisionless, unmagnetized, inhomogenous, and quiesent. To model specular reflection from the critical surface, the microwaves are initially reflected by a grounded screen. The resulting standing microwaves drive a resonant ion wave that grows for powers above a clearly defined threshold. This threshold and the growth rate are in good agreement with theory. Well above threshold, greater than 90% of the incident microwaves are scattered by ion quasi-modes. The phase velocity of these ion waves increases linearly with power and is very high, V/sub phase/ approx. = 5C/sub s/, at high powers, (v/sub 0s//v/sub e/)/sup 2/ approx. = 1. Near threshold the phase velocity is that of a normal mode, V/sub phase/ approx. = C/sub s/. Well above threshold, the ion wave amplitude is believed to be limited only by pump depletion.

• Research Organization: California Univ., Davis (USA)
• OSTI ID: 5801133
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
COLLISIONLESS PLASMA
HIGH-FREQUENCY DISCHARGES
MICROWAVE RADIATION
INTERACTIONS
BRILLOUIN EFFECT
ION WAVES
COHERENT SCATTERING
ELECTRIC DISCHARGES
ELECTROMAGNETIC RADIATION
PLASMA
PLASMA WAVES
RADIATIONS
SCATTERING
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