Fraction and Temperature of Hot Electrons Generated by Laser-Plasma Interaction at the Shenguang-II Laser Facility
ZHANG Jia-Tai1, QI Lan-Ying2, ZHU Sen-Chang1, YI Rong-Qing2, ZHENG Chun-Yang1, LI Chao-Guang2
1Institute of Applied Physics and Computational Mathematics, P.O. Box 8009, Beijing 100088
2Centre of Laser Fusion, China Academy of Engineering Physics, P.O.Box 919, Mianyang 621900
Fraction and Temperature of Hot Electrons Generated by Laser-Plasma Interaction at the Shenguang-II Laser Facility
1Institute of Applied Physics and Computational Mathematics, P.O. Box 8009, Beijing 100088
2Centre of Laser Fusion, China Academy of Engineering Physics, P.O.Box 919, Mianyang 621900
Abstract： We have developed a three-dimensional electron-photon Monte Carlo transmission (MCT) code. The conversion-transmissivity coefficient of hot electron x-ray, ηct, is analysed theoretically and simulated numerically using the MCT code. Experiments of disc and cylindrical targets have been performed at the Shenguang-II laser facility. A multi-channel filter-fluorescence spectrometer was used to obtain the hard x-ray spectrum. The temperature and energy of hot electrons are induced from the hard x-ray spectrum and the ηct value. The average energy fraction of hot electrons is 14% of incident laser energy for the 1ωNd laser and the spherical target, and the average temperature of hot electrons is 36keV, while 15% for the 1ωNd laser and the cavity target with the average temperature of 54keV. Also, we obtained the results of 5.6% and 13.3 keV for the 3ωNd laser and the disk target, 4.9% and 17.9keV for the 3ωNd laser and the half cavity target with a thin wall, and 2.1% and 22.45keV for those with a thick wall. The experimental results agree with theory and simulation.
(Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.))
引用本文:
ZHANG Jia-Tai;QI Lan-Ying;ZHU Sen-Chang;YI Rong-Qing;ZHENG Chun-Yang;LI Chao-Guang. Fraction and Temperature of Hot Electrons Generated by Laser-Plasma Interaction at the Shenguang-II Laser Facility[J]. 中国物理快报, 2002, 19(2): 224-226.
ZHANG Jia-Tai, QI Lan-Ying, ZHU Sen-Chang, YI Rong-Qing, ZHENG Chun-Yang, LI Chao-Guang. Fraction and Temperature of Hot Electrons Generated by Laser-Plasma Interaction at the Shenguang-II Laser Facility. Chin. Phys. Lett., 2002, 19(2): 224-226.
2002, Vol. 19 
