铁氧体环形器微放电阈值快速粒子模拟

摘要

本文建立了一种计算铁氧体环形器微放电阈值的快速粒子模拟方法,首先采用CST微波工作室获得铁氧体环形器中的交变电磁场、静磁场分布和边界三角形信息,利用跳步法求解粒子运动轨迹,然后通过Furman模型计算单次碰撞产生的二次电子发射系数,根据粒子数目随时间的增长曲线来判断是否发生微放电.以结型铁氧体环形器为研究对象,分别采用该方法和CST粒子模拟方法计算其微放电阈值,计算结果表明,本方法不仅具有与CST粒子模拟方法相当的计算精度,而且在计算效率上提高6倍以上.%This paper proposed a fast particle-in-cell (PIC) method for calculating the multipactor threshold of ferrite circulators.First the distribution of electromagnetic field and static magnetic field,as well as the information of triangle boundary inside the ferrite circulator are obtained using the CST Microwave Studio;then particle trajectories are solved with the leapfrog scheme;and then the secondary electron yield (SEY) at each electron collision is computed with Furman's model.The multipactor threshold is ultimately determined upon the electron growth with time.For comparative investigation,the multipactor threshold of ferrite circulator is calculated with the proposed method and with the CST Particle Studio separately.The proposed method can achieve the same calculation accuracy but with 6 times calculation efficiency when compared with the CST method.