Aiming at the requirements of high beam current density and low-ripple electron beam focusing for high power and high frequency vacuum electronic devices,a high peak-value and high-harmonic adjustable combined-periodic permanent magnet focusing system is designed,theoretically modeled and computed.The structure introduces a new pole piece to form a combined period to adjust the high harmonics of the magnetic field to improve the stability of high current density electron beam.In order to optimize the high harmonics of the magnetic field,in order to optimize the high harmonics of the magnetic field and further expand the stability region of the magnetic field parameter,the influence of the magnetic field strength at the pole is considered,and a the-oretical model is established on the basis of the idealized theoretical model.By analyzing the influence of each parameter of the fo-cusing structure on the different harmonics respectively and comparing the results of the calculations with those of the CST software,the calculation error at the peak of the magnetic field of the theoretical model is reduced from 8.08％to 3.91％,and the average error is reduced from 1.30％to 1.04％,which provides a good basis for the rapid design of the composite-cycle permanent magnet focusing system rapid design provides a method.
关键词
复合周期/周期永磁/磁场分布计算/行波管
Key words
combined-periodic/periodic permanent magnet/calculation of the axial magnetic field/traveling wave tube
维普
万方数据