| 腔靶金M带辐射角分布测量 |
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| 引用本文： | 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):2887-2890. |
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| 作者姓名： | 杜华冰 郭亮 李三伟 杨冬 李志超 宋天明 杨家敏 |
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| 作者单位： | 1.中国工程物理研究院 激光聚变研究中心, 四川 绵阳 621 900 |
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| 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。
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| 关 键 词： | 金M带 角分布 带通滤片 平响应 X射线二极管 |
| 收稿时间： | 2013-02-01 |
Measurement of gold M-band emission’s angular distribution |
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| Affiliation: | 1.Research Center of Laser Fusion,CAEP,P.O.Box 919-986,Mianyang 621900,China |
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| 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 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. |
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