研究设计双锥厚针孔结构体, 利用小孔成像测量高能强流直线感应加速器光源的焦斑。建立数值计算模型, 根据实际光源特性和实验布局条件, 模拟光子穿过厚针孔结构的辐射成像过程, 分析光源尺寸、分布和偏轴等对焦斑测量的影响。理论计算结果显示对光源物面的空间分辨率可达5 lp/mm。

The structure of thick pinhole with double cones is studied and designed for the spot size measurement of the high-energy intense-current linear induction accelerator (LIA) light source. The theoretical model for numerical calculations is built up according to the parameters of the light source and the practical layout of the experimental measurement. The imaging process of photons penetrating through the thick pinhole structure is simulated, and the impact of the spot size, distribution and off axis on the source spot measurement is analyzed. Calculated results show that the spatial resolution on the source plane reaches 5 lp/mm.