摘要
随着航天器有效载荷技术向高功率、小型化持续发展,复杂结构微波部件微放电数值模拟与阈值分析成为影响微放电分析的基础瓶颈问题。基于电磁时域有限差分计算方法与粒子模拟技术,结合二次电子发射模拟,提出了微放电电磁粒子联合仿真方法,数值模型中考虑了真实电子间的库仑力以及电子运动产生的电荷和电流变化对电磁场的影响,解决了复杂结构微波部件微放电三维数值模拟技术难题。实现了在统一的三维空间网格与时间步进行电磁场值演变计算、电子运动状态变化推进计算与二次电子产额与能量分布计算,基于得到的二次电子数目随时间变化趋势实现了微放电阈值预判,通过微放电电子随时间演化获得了微放电过程具体物理图像及放电位置,并与实际器件微放电实验进行了对比验证。结果表明,所提出的三维电磁粒子数值模拟方法可对大功率微波部件微放电效应的物理过程与具体放电位置进行三维描述,预测的阈值与微放电实验测量值吻合良好,误差小于1.2dB,验证了该方法的有效性与准确性,对于深入研究微放电效应微观物理机制、提高大功率微波部件微放电设计与分析水平具有重要意义。
With the development of high power and miniaturization in satellite payload, accurate simulation and threshold analysis for multipactor incomplex component becomes bottleneck problem. Based on the particle-in-cell technology and the secondary electron emission theory,a three-dimensional simulation method for multipactor was presented.The numerical algorithm was self-consistent since the interaction between electromagnetic fields and particles was properly modeled.The generation of multipactor is visualized,so that a deep insight into the physical mechanisms of this effect was gained. In order to validate the method, multipaction in the impedance transformer was studied.By analyzing the evolution of the electron numbers obtained by our method,multipactor thresholds of these components were estimated and the most sensitive positions where multipactor occurs were visualized.The results show good agreement with the experimental results and the simulation error is less than 1.2 dB.
作者
李韵
崔万照
张洪太
殷新社
王洪广
张剑锋
贺永宁
LI Yun CUI Wanzhao ZHANG Hongtai YIN Xinshe WANG Hongguang ZHANG Jianfeng HE Yongning(Key Laboratory of Physical Xi＇an 710049, China Science and Technology on Xi＇an 710100, China Electronics and Devices of the Ministry of Education, Xi＇an Jiaotong University, Space Microwave Laboratory, China Academy of Space Technology （ Xi＇an State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China)
出处
《中国空间科学技术》
EI
CSCD
北大核心
2017年第2期73-80,共8页
Chinese Space Science and Technology
基金
国家自然科学重点基金(U1537211)
空间微波技术重点实验室基金重点项目(9140C530101150C53011)
关键词
空间
大功率
微放电
数值模拟
无源器件
space
high power
multipactor
numerical simulation
passive component
