腔靶金M带辐射角分布测量  

Measurement of gold M-band emission's angular distribution

作　　者：杜华冰[1] 郭亮[1] 李三伟[1] 杨冬[1] 李志超[1] 宋天明[1] 杨家敏[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》2013年第11期2887-2890,共4页High Power Laser and Particle Beams

摘　　要：在黑腔实验中使用了一种滤片选通的平响应X光探测器,探测器基于Al阴极X射线二极管构成,并结合了一种特殊结构的复合滤片,实现了在金M带能区的带通平响应特性,探测器响应曲线的平整度好于10%。应用这种新型探测器,从不同方向测量了金等离子体在M带能区的腔外绝对辐射量和角分布。由实验发现,随着探测器与腔轴之间角度的增加,探测器透过激光注入口的观测视场减小,同时观测区域等离子体温度下降,从而导致探测器测量到的M带能量变小;输运腔在激光注入过程中存在等离子体堵腔效应,输运腔的M带能量份额比大腔的份额要高。It is important to reduce the capsule preheating from gold M-band emission in inertial confinement fusion experi ments. A flat-response X ray detector consisted of particular compound filters and an X-ray diode was adopted to measure the evo lution of gold M band X-ray from different directions from laser entrance hole. The spectral response of detector is not exactly flat on gold M band, which will introduce uncertainty into the calculation. Thus, a calibration result was given, showing 1.hat flatness degree of the spectral response was better than i0%. Less M-band energy was observed with the detectors with larger observation angles with respect to the hohlraum axis. Higher energy conversion efficiency of laser to M-band X-ray was observed in R-T hohl raum experiments than that in large hohlraum.

关 键 词：金M带 角分布 带通滤片 平响应 X射线二极管 

分 类 号：O434.1[机械工程—光学工程]