用三维电子输运Monte-Carlo(MC)方法研究了双向四电子束泵浦KrF准分子激光器MOPA系统中主放大器(H1M)的能量沉积空间分布。计入了Hibachi结构和主膜的影响。对0.5 MeV的电子,泵浦方向能量沉积基本均匀,而在轴向,因为两窗口间的14 cm“死区”使得能量沉积呈“马鞍形”,峰谷比为2～3。给出了能量沉积的总量及能量沉积效率与电子束能的关系曲线,为Marx发生器的二极管电压进行优化设计提供了依据。

The spatial profile of the energy deposition for the main amplifier (H1M) of a KrF laser MOPA system is presented by meams of 3D Monte Carlo method. The effects of Hibachi structure and main foils are considered. For 0.5 MeV electron, the energy deposition distributions of pumping direction are almost uniform. In the lasing direction (axial), because of a 14 cm unpumped area between two e beam windows the spatial profile of energy deposition takes the shape of a saddle. The peak valley ratio is 2～3. In addition, the relations of the total deposition energy and the energy deposition efficiency with the e-beam energy are given. The total deposition energy and the energy deposition efficiency reach the maximum when the e-beam energy is equal to 0.5 MeV and 0.31 MeV, respectively.