强激光与粒子束, 2013, 25 (11): 2887, 网络出版: 2013-11-14  

腔靶金M带辐射角分布测量

Measurement of gold M-band emission’s angular distribution
作者单位
中国工程物理研究院 激光聚变研究中心, 四川 绵阳 621900
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。
Abstract
It is important to reduce the capsule preheating from gold M-band emission in inertial confinement fusion experiments. A flat-response X-ray detector consisted of particular compound filters and an X-ray diode was adopted to measure the evolution 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 that flatness degree of the spectral response was better than 10%. 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 hohlraum experiments than that in large hohlraum.

杜华冰, 郭亮, 李三伟, 杨冬, 李志超, 宋天明, 杨家敏. 腔靶金M带辐射角分布测量[J]. 强激光与粒子束, 2013, 25(11): 2887. Du Huabing, Guo Liang, Li Sanwei, Yang Dong, Li Zhichao, Song Tianming, Yang Jiamin. Measurement of gold M-band emission’s angular distribution[J]. High Power Laser and Particle Beams, 2013, 25(11): 2887.

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