金属壁与介质窗之间次级电子倍增效应的研究

高功率盒形窗内的TM11模法向电场对次级电子倍增现象具有较大的影响,特别是在介质窗片与金属波导壁相对的区域,易发生双面次级电子倍增.采用蒙特卡罗粒子模拟方法,研究了法向电场作用下氧化铝陶瓷窗片与铜波导壁之间的双面倍增敏感曲线、倍增阈值电压、粒子数量的演变过程以及粒子运动轨迹.通过对相关参数的分析,获得了金属壁与陶瓷窗片之间双面谐振倍增和非谐振倍增的规律以及双面倍增向单面倍增转变的特点.此研究可为分析窗片失效机理提供理论依据.

Multipactor phenomenon between metal anddielectric window

The multipactor phenomenon between metal wall and dielectric window disk of pill-box window can behave as double surface multipactor, which is affected by the normal electric field of TM₁₁ mode. The Monte Carlo code is used to build up simulation model, calculate the multipactor susceptive curve, threshold voltage, evolution of particle number, and the trajectory of particle motion under the action of double surface normal field between alumina window and copper wall. Through investigating the behavior of secondary electrons, the regularity of normal field double surface resonant multipactor and non-resonant multiapctor is achieved. Besides, the feature of the transform from double-surface multipactor to single-surface multipactor is also obtained. This research can provide a theoretical basis for window breakdown mechanism analysis.
Keywords： pill-box window non-resonant multipactor Monte Carlo simulation