中国空间科学技术2017，Vol.37Issue(2)：24-31,8.DOI:10.16708/j.cnki.1000-758X.2017.0030
介质带电平衡模式的二次电子发射暂态特性
Transient characteristics of secondary electron yield based on charging balance mode
摘要
Abstract
The essential relationship between secondary electrons emission and charging states of dielectric was investigated based on charging balance mode with numerical simulation.Both Monte Carlo and finite-difference time-domain algorithms were adopted for numerical simulation,considering elastic and inelastic essential between incident electrons and material atoms during scattering process and calculating diffusion,drift and trap effects of internal charges. Under different charging balance modes,the secondary electron emission and charging states of dielectric on transient change, internal distributions and saturation values were analyzed and simulated.The results show that charging balance modes can be divided into the secondary electron (SE) mode,the leakage electron (LE)mode and the combined (CO)mode.The SE mode corresponds to the surface charging state,while the LE mode corresponds to the deep charging state. When the charging balance mode changes towards SE mode from LE mode,both the secondary electron yield and the negative surface potential increases,while variation trends of the total charging quantity and charging time constant present to be opposite as a result of balance mode change.关键词
二次电子发射/平衡模式/带电效应/电子辐照/数值模拟Key words
secondary electron emission/balance mode/charging effect/electron irradiation/numerical simulation分类
航空航天引用本文复制引用
封国宝,李军,崔万照,刘纯亮,曹猛..介质带电平衡模式的二次电子发射暂态特性[J].中国空间科学技术,2017,37(2):24-31,8.基金项目
国家自然科学基金 (U1537211,11675278,51675421) （U1537211,11675278,51675421）
中国博士后基金 (2016M602944XB) （2016M602944XB）
