物理学报2017，Vol.66Issue(15)：290-299,10.DOI:10.7498/aps.66.157901
多载波微放电阈值的粒子模拟及分析
Particle simulation and analysis of threshold for multicarrier multipactor?
摘要
Abstract
The multicarrier multipactor is a phenomenon that can be observed in vacuum environment due to the effect of secondary electron emission. Accurate analysis of the threshold of multicarrier multipactor is crucial for the long-term reliability of high-power spaceborne microwave system, and therefore it has been attracting more and more interests in fields of high-power microwave community, plasma physics and aerospace engineering. Recently, a new mechanism of multicarrier multipactor, termed "long-term" multipactor, induced by sustained accumulation of residual electrons between successive envelope periods of multicarrier signals has received much attention. Comparing with the "single-event" multipactor induced by the electron accumulation inside a single envelop period, researchers tend to believe that the threshold of the long-term discharge should be lower. However, recent experimental results show an opposite conclusion. In this work, in order to investigate the contradiction between the experimental and theoretical studies on the thresholds of multicarrier multipactors, particle simulations are used to simulate the evolution process of the multicarrier multipactor under the same conditions and judgement criterion. The behavioral characteristics and occurrence condition for multicarrier multipactors, especially the single-event ones, are analyzed based on a power scanning analysis, and the conflicting results are effectively explained. Our simulations show that if the evolution process of a multipactor can be divided into three phases, i.e., establishment phase, critical phase and saturation phase, the experimental reflection coefficient can be corresponding to the reflection coefficient simulated in the critical phase. The simulation results indicate that the type of the multipactor discharge would depend on the configuration of multicarrier signals. For multicarrier signals with relatively narrow bandwidths, single-event multicarrier multipactors could occur in the first place at a lower threshold power. Therefore, the threshold of a long-term discharge is not necessarily lower than that of a single-event one. This conclusion is important for estimating and suppressing the multicarrier multipactors in the design of high-power spaceborne microwave components.关键词
多载波/微放电阈值/微波部件/粒子模拟Key words
multicarrier/multipactor threshold/microwave components/particle simulation引用本文复制引用
王新波,张小宁,李韵,崔万照,张洪太,李永东,王洪广,翟永贵,刘纯亮..多载波微放电阈值的粒子模拟及分析[J].物理学报,2017,66(15):290-299,10.基金项目
国家自然科学基金(批准号:U1537211 和空间微波技术重点实验室基金(批准号:9140C530101150C53011 资助的课题. Project supported by the National Natural Science Foundation of China(Grant No. U1537211 and the Foundation of National Key Laboratory of Science and Technology on Space Microwave, China(Grant No. 9140C530101150C53011. （）
