钛空腔靶高强度keV X射线源的实验研究
High Power Laser and Particle Beams（2015）
Abstract
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.
MoreKey words
X-ray source,laser,hohlraums,conversion efficiency
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