高能通量脉冲电子束作用下钽靶破坏初步研究

 使用Monte-Carlo程序MCNP在2维情况下模拟得到了高能通量脉冲电子束在钽金属靶中的能量沉积。根据能量沉积的模拟结果以及实验后靶上穿孔的大小和形貌，提出了电子束对不同结构钽金属靶破坏的物理机制。由于能量沉积的差异，1 mm实心靶中的热激波在一定时间内沿径向和轴向持续对靶材进行压缩，而在叠靶中这种压缩效果并不明显，因此实验后1 mm实心靶上穿孔的大小几乎是叠靶上的两倍。根据理论模型分析得到的靶材熔融喷射和层裂现象与实验结果相吻合。

Basic study on destruction of tantalum target bombarded by high energy flux pulse electron beam

A Monte-Carlo program MCNP is used to simulate the energy deposition of high energy flux pulse electron beam in the target material, According to the simulation results and the size and the character of the hole on the tantalum target by electron beam bombardment, the basic physical destruction mechanism of structure-different tantalum targets is presented. Due to the difference of the energy deposition in different targets, the shock wave in the 1 mm solid target will develop and compress the tar- get in both radial and axial directions, while the compression in the foil target is inapparent, the size of the hole on the 1 mm solid target almost doubles that of the foil target. The melt election and spallation in the theoretical model are in accordance with the experiment result.