辐射输运实验中的Al等离子体发射光谱研究  

Characteristics of emission spectroscopy of radiatively heated Al plasma

作　　者：蒲昱东[1] 杨家敏[1] 靳奉涛[1] 张璐[1] 丁永坤[1] 

机构地区：[1]中国工程物理研究院激光聚变研究中心

出　　处：《物理学报》2011年第4期412-417,共6页Acta Physica Sinica

基　　金：等离子体物理国家级重点实验室基金(批准号:9140C6801020801)资助的课题~~

摘　　要：SGII装置上用八路激光注入金腔产生高温辐射源,然后利用该辐射源来加热输运腔中的掺Al泡沫样品.从测量得到的Al类氦离子发射光谱可以观察到a—d,qr伴线的强度明显高于jkl伴线的强度,由此可以确定出光子激发和电离过程对输运腔中等离子体的形成不可忽略.除此之外,还观察到较强的互组合线发射,这表明存在一个低密度区域.最后考虑到实验测量得到的Al类氦离子发射光谱是时间、空间积分,利用两个状态等离子体的发射光谱合成再现了实验光谱.The X-ray spectrum of radiatively heated tracer Al in the doped foam was recorded by using a flat crystal spectrometer.The radiation thermal bath with a peak temperature of 150 eV is created inside the hohlraum irradiated by 8 laser beams,each delivering 250J.From the measured spectrum,we have observed that the intensities of jkl Li-like satellite were smaller than those of qr Li-like satellites,which is not a case usually encountered in electron collision dominated low density plasmas.The analyses of various generation and loss channels of doubly excited states indicate that in the radiatively heated plasma considered in the present work,the photo excitation and the photo ionization processes are fully responsible for the generation of doubly excited states instead of dielectronic recombination.Besides the satellite features,intercombination lines are also observed which imply the existence of a low density plasma region.Finally,we compare the calculated spectrum with the measured spectrum,and find that they are in fairly good agreement was achiered.

关 键 词：发射光谱 辐射加热 光谱诊断 

分 类 号：O536[理学—等离子体物理]