中文摘要：

介绍了直线感应加速器聚焦段的结构模型,成功地使用了非均匀网格模型,实现了对直线感应加速器聚焦段的三维数值建模。利用独立编写的螺线管线圈和磁透镜计算程序,将磁元件的场分布设置到三维模型中。模型结合PIC与FDTD方法模拟聚焦段内电子注的传输、聚焦过程,并将结果与文献做比较,验证了模拟的正确性。模拟结果对直线感应加速器聚焦段的调试有一定的指导意义,为试验调节节省开支。

英文摘要：

A structural model of the focusing section of linear induction accelerator （LIA） is introduced. The 3D numerical model of the focusing section of LIA was built by using a non-uniform mesh model. The field distribution of magnetic components is set to a three~dimensional model based on the independently programed calculation program of the solenoid coil and the magnetic lens. The model simulates the transmission and focusing process of electron in the focusing section of LIA in combination with PIC and FDTD methods. The correctness of the simulation is verified by comparing the results with the conference literature. The results have some significance to the debugging of the focusing section of LIA.