Comment on Energy and nonlinearity considerations for the enhanced plasma wave model of Raman scattering'' (Phys. Fluids B 1 , 1073 (1989))

Journal Article · Mon Jan 01 04:00:00 EST 1990 · Physics of Fluids B; (USA)

DOI:https://doi.org/10.1063/1.859533· OSTI ID:6980512

Drake, R P ^[1]

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1. Lawrence Livermore National Laboratory, Livermore, California 94550 (US)

The interpretation of some recent experiments (Phys. Rev. Lett. {bold 60}, 1018 (1988); Phys. Fluids {bold 30}, 1795 (1988)) by Simon and Short (Phys. Fluids B {bold 1}, 1073 (1989), referred to as SS4) is discussed. The predicted angular distribution is almost narrow enough to correspond to the data discussed in SS4, but not to correspond to data from previous experiments having similar plasma-wave damping but much smaller density-gradient scale length. Examination of the time dependence of the Raman spectrum in all the data, rather than only the single case discussed in SS4, shows that the hydrodynamic behavior, rather than the vanishing of quarter critical, determines the time of maximum emission. Finally, it is notable that the analysis of the power flow in SS4 requires that most of the laser energy be converted into intense electron beams with narrow velocity distributions having intensities of 20{times} the average laser power. Though not impossible, this seems unlikely.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6980512
• Journal Information: Physics of Fluids B; (USA), Journal Name: Physics of Fluids B; (USA) Vol. 2:1; ISSN 0899-8221; ISSN PFBPE
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700108* -- Fusion Energy-- Plasma Research-- Wave Phenomena
ANGULAR DISTRIBUTION
BEAMS
DAMPING
DISTRIBUTION
ELECTRON BEAMS
FLUID MECHANICS
HYDRODYNAMICS
LEPTON BEAMS
MECHANICS
NONLINEAR PROBLEMS
PARTICLE BEAMS
PLASMA
PLASMA SIMULATION
PLASMA WAVES
RAMAN EFFECT
SCALING LAWS
SIMULATION