“神光Ⅱ”基频光黑腔靶实验超热电子诊断  

The experimental diagnostics of hot electrons from hohlraum targets irradiated by 1ω_0 light at “Shenguang Ⅱ”

作　　者：祁兰英[1] 蒋小华[1] 陈家斌[1] 刘慎业[1] 郑志坚[1] 张保汉[1] 丁永坤[1] 李朝光[1] 王大海[1] 朱森昌[2] 张家泰[2] 

机构地区：[1]中国工程物理研究院高温高密度等离子体物理国家重点实验室,绵阳621900 [2]北京应用物理与计算数学研究所,北京100088

出　　处：《物理学报》2002年第9期2063-2067,共5页Acta Physica Sinica

基　　金：国家高技术研究发展计划 (批准号 :863 416 3 )资助的课题~~

摘　　要：介绍“神光Ⅱ”首次进行大能量基频光黑腔靶实验超热电子实验观测 ,采用十道滤波 荧光谱仪 (FFS)测量腔靶发射 1 5— 2 5 0keV硬x射线谱 ,由高能x射线谱通量推断超热电子占入射激光能量份额 ηhe为 13%— 16 % ,由谱的斜率推断超热电子温度Th 为 35— 4 5keV ,由超热电子能量和受激拉曼散射光 (SRS)能量的关联 ,推断超热电子产生的机理 ,并给出了不同腔靶在不同激光能量ELThis paper presents the first experimental observation of hot electrons produced by the 1 053μm high power laser with hohlraum targets.This experiment was performed at the ShengguangⅡ facility. The multi channel filter fluorescence spectrometer was used to measure the hard x ray spectra with energies ranging from 1 5—250keV emitting from hohlraum targets. The energy of hot electrons is 13%—16% of the energy of incidence laser and the temperature T h is 35—45keV, which was detected by the flux of high energy spectra and its slope separately. And the generation mechanism of hot electrons from hohlraum targets is inferred from the correlation between the hot electron energy E he and the Stimulated Raman Scattered (SRS) light energy E srs . The characteristics of hot electrons produced under the conditions with different laser energy E L are given for various types of hohlraum targets.

关 键 词：“神光Ⅱ” 基频光 超热电子 黑腔靶 大能量激光 激光诊断 惯性约束聚变 

分 类 号：TN247[电子电信—物理电子学]