强激光与粒子束, 2015, 27 (3): 032021, 网络出版: 2015-03-23
钛空腔靶高强度keV X射线源的实验研究
Experimental investigation of titanium hohlraum as intense multi-keV X-ray source
摘要
利用神光-Ⅲ原型激光装置实验研究了8束ns激光脉冲从一端注入钛空腔靶产生的keV X射线源的辐射特征, 发现keV X射线主要产生于腔轴附近; 钛空腔靶内径过大时keV X射线能流的峰值强度较低, 内径过小时keV X射线能流的持续时间较短。为了在4π空间内使钛空腔靶获得最大的X射线(4~7 keV能段)转换效率, 腔内径的最优值在1000~1300 μm附近, 此时的keV X射线转换效率为4.7%, 是相同激光参数下钛平面靶的2倍左右。激光单端注入有底部钛膜和无底部钛膜的空腔靶对比实验显示,底膜能够增强keV X射线的发射。
Abstract
The titanium hohlraum as a bright X-ray source was explored on the Shenguang-Ⅲ prototype laser facility. It shows that the multi-keV X-rays are mainly generated near the cylinder axis. The multi-keV X-ray emission region and the duration increase with the increase of the hohlraum inner diameter, but the X-ray flux decreases, thus the optimal hohlraum inner diameter is in the range of 1000-1300 μm for Shenguang-Ⅲ prototype laser facility. The presence of the bottom foil for the hohlraum can enhance the X-ray emission. The maximum X-ray conversion efficiency of the titanium hohlraums is 4.7% in 4π space, which is larger than that of the solid planar target.
涂绍勇, 胡广月, 缪文勇, 袁永腾, 赵斌, 郑坚, 侯立飞, 晏骥, 詹夏宇, 江少恩, 丁永坤. 钛空腔靶高强度keV X射线源的实验研究[J]. 强激光与粒子束, 2015, 27(3): 032021. Tu Shaoyong, Hu Guangyue, Miao Wenyong, Yuan Yongteng, Zhao Bin, Zheng Jian, Hou Lifei, Yan Ji, Zhan Xiayu, Jiang Shaoen, Ding Yongkun. Experimental investigation of titanium hohlraum as intense multi-keV X-ray source[J]. High Power Laser and Particle Beams, 2015, 27(3): 032021.
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