行波管中静态轨迹的研究
Analysis of static trajectories in traveling wave tubes
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摘要: 研究了行波管中均匀聚焦磁场和周期永磁聚焦磁场对轨迹波动的影响。推导了这两种磁场下轨迹波动周期和幅值，讨论了磁场强度对轨迹的影响。解释了聚焦磁场存在小的波动的原因，并且通过计算得出小波动的周期为磁场周期的1/2，揭示了在周期永磁聚焦磁场下，电子轨迹近似等效于周期为周期永磁聚焦磁场1/2的小波动和均匀磁场形成的波动轨迹的叠加。利用电子科技大学编写的微波管模拟套装中的3维注-波互作用模块进行了静态轨迹计算，验证了理论推导。Abstract: The ripple of static trajectories focusing by the uniform solenoidal magnetic field and periodic permanent magnetic(PPM) field has been studied. the period and the amplitude of the ripple by the two kinds of field has been concluded. The effect of the magnetic field strength has been discussed. The small wavelet by PPM field has been reasoned out, whose period is a half of the PPM field period. The ripple of static trajectories by PPM field is nearly equivalent to the one by solenoidal magnetic field superposing the small wavelet. The ripple has been proved by 3D beam-wave interaction simulator(BWIS) module of microwave tube simulator suite(MTSS),which was developed by University of Electronic Science and Technology of China.
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