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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
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| Cite this article: |
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ZHANG Jia-Tai, QI Lan-Ying, ZHU Sen-Chang et al 2002 Chin. Phys. Lett. 19 224-226 |
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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.
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| Keywords:
52.40.Nk
52.25.Kv
52.50.Jm
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Published: 01 February 2002
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