Experimental investigation of titanium hohlraum as intense multi-keV X-ray source
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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4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 m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 m 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 4 space, which is larger than that of the solid planar target.
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Key words:
- X-ray source /
- laser /
- hohlraums /
- conversion efficiency
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