Al激光等离子体电子温度的时间分辨诊断  

Time-resolved diagnosis of the electron temperature of laser-produced aluminum plasma

作　　者：张继彦[1] 杨家敏[1] 郑志坚[1] 杨国洪[1] 丁耀南[1] 张文海[1] 王耀梅[1] 李军[1] 

机构地区：[1]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《强激光与粒子束》2004年第9期1153-1156,共4页High Power Laser and Particle Beams

基　　金：国家自然科学基金资助课题(10275056);中国工程物理研究院基金资助课题(20020210)

摘　　要：　将门控分幅相机与平面晶体谱仪耦合,构成时间分辨光谱测量系统,对Al激光等离子体的K壳层发射谱进行测量,获得了相对入射激光延迟约1ns,积累时间约200ps的光谱信号。利用稳态碰撞 辐射平衡(CRE)近似条件下的等离子体光谱辐射动力学模型,给出了Al激光等离子体Ly β线与He β线强度比以及Ly γ线与He γ线强度比与电子温度的函数关系。在此基础上,根据实验谱线强度比,得到激光强度为2.319×1014,1.937×1014和3.946×1014W/cm2时,等离子体冕区电子温度分别为1.190(1±27%),1.165(1±27%)和1.525(1±27%)keV。Time-resolved measurement system of X-ray spectroscopy was constructed by coupling a gated MCP with a flat crystal spectrometer, and the K-shell emission spectra from the corona of laser-irradiated aluminum plasma, were measured with a time delay of about 1ns and with an exposure time of about 200ps. Using the approximation of steady collisional-radiative equilibrium model, the interstage line intensity ratios of the K-shell lines of aluminum were given as a function of electron temperature and density. The electron temperatures were deduced from the line intensity ratios. The diagnosed electron temperatures of the plasmas were 1.190(1±27%),1.165(1±27%), and 1.525(1±27%)keV respectively at laser intensity of 2.319×10^(14), 1.937×10^(14), and 3.946×10^(14)W/cm^2 ?

关 键 词：电子温度 时间分辨 Al激光等离子体 X射线光谱学 

分 类 号：O536[理学—等离子体物理] O562.3[理学—物理]