摘要
利用神光一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keVx射线源的辐射特征，发现keVx射线主要产生于腔轴附近；钛空腔靶内径过大时keVx射线能流的峰值强度较低，内径过小时keVX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keVX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keVX射线的发射。
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.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2015年第3期170-175,共6页
High Power Laser and Particle Beams
基金
国家自然科学基金项目(11105147
11375197
11175179)
教育部创新团队基金项目(IRT1190)
强场激光物理国家重点实验室开放基金项目
关键词
X射线源
激光
空腔靶
转换效率
X-ray sourcel laser
hohlraums
conversion efficiency
