Hot electron and stimulated Raman scattering in laser cavity target plasma
- Inst. of Applied Physics and Computational Mathematics, Beijing (China)
Stimulated Raman scattering (SRS) and X-ray spectrum emitted from many kinds of targets were experimentally investigated on the Nd; glass laser facility Shenguang-I in Shanghai, China. By theoretical analysis and computer simulation for these experiments, the result showed that the mechanism of hot electron generation in laser cavity target was mainly SRS, according to detailed comparison between the cavity target and the plane target. In cavities, as the energy of incident light and density scaling length increase, SRS energy and hot electron energy increase nonlinearly. E{sub SRS} is roughly equal to E{sub He}. Generally, the energy is 10% of incident laser energy, the highest is up to 20%. E{sub 2{omega}} and E{sub 3/2{omega}} are nearly 1--2 {per_thousand} and 4--5{per_thousand} of incident energy, respectively. While incident light energy is larger than 400J, also, the authors may observe forward SRS. Its energy is 1{per_thousand} of incident energy. The wave length of SRS spectrum is in the range of 1.45--2.0 {mu}m. The FWHM is 0.2--0.34 {mu}m. The wave length at peak value is 1.72--1.89 {mu}m. In addition, temperature of thermal electron (1.0--2.5Kev) in the underdense coronal plasma region is determined by spectrum analysis of SRS light, as well as contour figure for density distribution and average density (n = 0.12 {approximately} 0.16n{sub c}, at n {le} 1/4 n{sub c}, n{sub c} is critical density). SRS energy and angular distribution were also presented in detail.
- OSTI ID:
- 42961
- Report Number(s):
- CONF-940604-; ISBN 0-7803-2006-9; TRN: IM9521%%125
- Resource Relation:
- Conference: 1994 Institute of Electrical and Electronic Engineers (IEEE) international conference on plasma science, Santa Fe, NM (United States), 6-8 Jun 1994; Other Information: PBD: 1994; Related Information: Is Part Of IEEE conference record -- Abstracts; PB: 252 p.
- Country of Publication:
- United States
- Language:
- English
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