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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。
The theory of three-dimensional second-order finite element method of microwave tube permanent magnet focusing system and the processing technology of nonlinear material are introduced. At the same time, these techniques have been applied to the magnetic field simulator (MFS) of three-dimensional microwave tube simulation package. By comparing the MFS results with ANSYS-Maxwell results, the MFS and commercial software ANSYS-Maxwell are respectively used to simulate the single-magnet ring and single-period structure. The results show that the peak errors of magnetic field of MFS and ANSYS-Maxwell axes are less than 3% For single-core structure simulation, MFS calculation time is only 41% of ANSYS-Maxwell; for single-period structure simulation, MFS calculation time accounts for 92% of ANSYS-Maxwell. Through these numerical examples, it is shown that the proposed nonlinear processing technique is effective. It also shows that MFS can be used in the engineering design of PM focusing structure.