外磁场对介质表面次级电子倍增效应的影响

Effects of an external magnetic field on multipactor on a dielectric surface

本文采用Particle-in-cell数值方法模拟研究了不同强度外磁场条件下的次级电子倍增效应过程,分析了外磁场对次级电子倍增效应的影响.结果表明,当外磁场达到一定强度时,次级电子倍增效应在微波传输的一半时间内被抑制.通过外磁场抑制,在理想条件下可以使介质窗的微波传输功率容量提高4倍以上.

The dielectric surface breakdown has become a major factor of restricting the output power of high power microwave source. And the multipactor is the key phase of the process of the dielectric surface breakdown.In this paper,the multipactors in external magnetic fields with different strengths are simulated by using the particle-in-cell method.And the effect of the external magnetic field on multipactor is also studied.The results show that when the external magnetic field reaches a certain value,the multipactor is suppressed in the half time of the microwave transmission.So the power capability can be increased to more than four times through the suppression of the multipactor by the external magnetic field under the ideal condition.