中文摘要：

介绍了微波管永磁聚焦系统三维二阶有限元方法的理论和非线性材料的处理技术,同时这些技术已经应用到三维微波管模拟套装的磁场模拟器（MFS）。通过MFS和商业软件ANSYS-Maxwell分别对单磁环和单周期结构进行仿真,并把MFS计算结果与ANSYS-Maxwell结果进行对比,结果表明：MFS和ANSYS-Maxwell轴线磁场峰值误差小于3%;同时对单磁环结构仿真时,MFS的计算时间只有ANSYS-Maxwell的41%;对单周期结构仿真时,MFS的计算时间占ANSYS-Maxwell的92%。通过这些数值实例说明了本文提出的非线性处理技术是有效的,同时也表明MFS能够用于永磁聚焦结构的工程设计。

英文摘要：

The magnetic field simulator（ MFS）,a module of Microwave Tube Simulator Suite,previously-developed by University of Electronic Science and Technology of Chinafor the permanent magnet focusing system of microwave tube,was developed on the basis of 3-D 2nd-order finite element method and nonlinear iteration. A permanent magnet ring made of Al Ni Co5 and a periodic permanent Al Ni Co5 magnet withaniron-1008 pole-shoe were simulated with both MFS and ANSYS-Maxwell. The results show that MFS outperforms ANSYS-Maxwell,and that the newly-proposed nonlinear iterative method works fairly well. For example,the relative discrepancy between the simulated peaks,of the magnetic field along the symmetric axis,was below 3%. The computation times simulated with MFS,for the permanent magnetic ring and for the periodic permanent magnet,were 41% and 92% of that simulated with ANSYS-Maxwell,respectively. We suggest that MFS be of some technological interest in design of permanent magnet focusing system.