神光Ⅱ黑腔等离子体时间分辨的电子温度诊断  

Measurement of time-resolved electron temperature of plasmas for Shenguang Ⅱ hohlraum

作　　者：杨国洪[1,2] 张继彦[1,2] 吴泽清[3] 丁永坤[1,2] 杨家敏[1,2] 胡昕[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 [2]等离子体物理重点实验室,四川绵阳621900 [3]北京应用物理与计算数学研究所,北京100088

出　　处：《强激光与粒子束》2010年第11期2613-2616,共4页High Power Laser and Particle Beams

基　　金：国家高技术发展计划项目

摘　　要：在神光Ⅱ强激光装置上,用条纹晶体谱仪对埋点于黑腔靶内壁上的双示踪Ti和Cr材料的激光等离子体高离化态离子发射的X射线谱线进行实验测量,获得超高时间分辨的X射线细致结构谱线。用碰撞辐射模型计算了非局域热动平衡的等离子体布居数,组态平均速率系数由一级微扰理论计算,电子波函数由Hartree-Fock Slater自洽场方法计算,给出了Ti和Cr激光等离子体在电子密度为1019~1022cm-3范围内的He-α线强比与电子温度的关系曲线。采用等电子X射线谱线法,获得了黑腔靶激光等离子体冕区的电子温度随激光脉冲加热从低温到高温、然后缓慢下降的演化过程,其峰值达到2.05 keV。Time-resolved spectra of highly ionized Cr and Ti tracers,which are buried in the inner wall of golden hohlraum,are measured by the streaked crystal spectrometer on the Shenguang Ⅱ laser facility.The collisional-radiative model is adopted for non-LTE（local thermodynamic equilibrium）population calculations,and configuration-averaged rate coefficients are obtained based on the first-order perturbation theory.Hartree-Fock Slater self-consistent field method is used to calculate electron wavefunctions.The isoelectronic line-ratio of He-α for Cr and Ti tracers is derived in the electron density range of 1019～1022 cm-3.The evolution of time-resolved electron temperature in hohlraum in the process of laser-plasma interaction is deduced by isoelectronic X-ray spectroscopy,and the peak temperature is 2.05 keV.

关 键 词：电子温度 时间分辨 黑腔靶 等电子X射线谱线法 

分 类 号：TL65[核科学技术—核技术及应用]