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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(4~7keV能段)转换效率,腔内径的最优值在1000~1300μm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。
Radiation characteristics of keV X-ray sources generated by injecting eight ns laser pulses from one end into a titanium cavity target were studied experimentally using a SG-III prototype laser device. It was found that the keV X-ray mainly occurs near the cavity axis. The target diameter of the titanium cavity The peak intensity of keV X-ray energy flow is large when large and the keV X-ray energy flow is short when the inner diameter is too small. In order to obtain the maximum X-ray (4 ~ 7 keV energy) conversion efficiency in the titanium cavity target in 4π space, the optimal value of the internal diameter of the cavity is around 1000 ~ 1300μm. The keV X-ray conversion efficiency at this time is 4.7% The same laser parameters under the titanium plane target about 2 times. Contrast experiments of single cavity laser injected with a hollow titanium target with a bottom titanium film and a bottom titanium film showed that the base film can enhance the emission of keV X-rays.