Stimulated Raman scattering, two-plasmon decay, and hot electron generation from underdense plasmas at 0. 35. mu. m
Experimental studies of stimulated Raman back and side scattering, two-plasmon decay, and the generation of high-energy electrons in 0.35 ..mu..m laser plasma interaction are presented. To isolate the various phenomena occurring at different densities, we have attempted to control the maximum plasma density by varying the thickness of the foil targets. The scattered light frequency is used as a diagnostic to measure the peak plasma density. Time integrated and time resolved scattered spectra for variable plasma densities are discussed. Effects of self-generated magnetic fields and plasma temperature on SRS and 2..omega../sub p/ decay, respectively, are examined as possible mechanisms responsible for splitting of the backscattered spectrum at ..omega../sub 0//2. A discussion of the effects of a parabolic density profile on the SRS threshold is also included. Finally, the measured energy and angular distribution of the high-energy electrons are discussed. Two-plasmon decay is suggested as the probable mechanism generating the hot electrons.
- Research Organization:
- University of California, Los Angeles, California 90024
- DOE Contract Number:
- AC08-80DP40124
- OSTI ID:
- 6665019
- Journal Information:
- Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 27:7; ISSN PFLDA
- Country of Publication:
- United States
- Language:
- English
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COHERENT SCATTERING
ELECTRON TEMPERATURE
FOILS
HOT PLASMA
INSTABILITY
LASER-PRODUCED PLASMA
LIGHT TRANSMISSION
MAGNETIC FIELDS
PARAMETRIC INSTABILITIES
PLASMA
PLASMA DENSITY
PLASMA DIAGNOSTICS
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
PLASMONS
QUASI PARTICLES
RAMAN EFFECT
RESOLUTION
SCATTERING
TIME RESOLUTION
TIMING PROPERTIES