预主脉冲辐照平面靶产生X射线激光的自相似模型

A SELF SIMILARITY MODEL OF SLAB X RAY LASER USING THE PREPULSE TECHNIQUE

利用自相似方法，定量地描述了预主脉冲辐照平面靶产生Ｘ射线激光的物理过程。解析地给出了各物理参量之间的关系，计算结果与实验符合的较好。结果表明：合理地选择预、主激光脉冲的能量匹配和时间间隔，就可以在较低能量的激光装置上产生较强的Ｘ射线激光输出。这一结果为简化预脉冲条件下平面靶Ｘ射线激光的实验设计和直观定量地解释实验结果提供了一套有用的工具。

Using self similarity method, the physics of slab X ray laser using the prepulse technique is quantitatively described. The analytical formulars between the plasma parameters are given and the calculations agree well with the experimental results. The calculations show that reasonably chosen the energy rate and the separation between the prepulse and the main pulse, the higher output of X ray laser produced by the lower drive laser energy can be obtained. This model provides a useful way to simplify the experimental design of slab X ray laser using the prepulse technique and quantitatively explains experimental results.