Thresholds of Raman backscatter: effects of collisions and Landau damping

Conference · Thu Nov 03 00:00:00 EST 1983

OSTI ID:5435461

Estabrook, K; Kruer, W L

We present 1.5 dimensional simulations and theory of the threshold of Raman backscatter for a variety of density profiles, background temperatures and collision frequencies, nu/sub ei/. The simulations show Raman backscatter of approx. 4 x 10/sup -4/ at intensities approx. 30 times below the del n threshold which we suggest is due to light scattering off of noise electron plasma waves. The absorption drops significantly and the threshold rises as the Landau damping ..omega../sub i/ and/or nu/sub ei/ approach the growth rate ..gamma../sub 0/. Many experiments are already in the collisional regime.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5435461
• Report Number(s): UCRL-89448; CONF-831105-4; ON: DE84003736
• Resource Relation: Conference: Meeting of the Plasma Physics Division of the American Physical Society, Los Angeles, CA, USA, 7 Nov 1983
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
LASER IMPLOSIONS
RAMAN EFFECT
LASER-PRODUCED PLASMA
BACKSCATTERING
COLLISIONS
ELECTRON PLASMA WAVES
LANDAU DAMPING
LASER FUSION REACTORS
PLASMA DENSITY
DAMPING
IMPLOSIONS
PLASMA
PLASMA WAVES
SCATTERING
THERMONUCLEAR REACTORS
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