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空间辐射环境中,由高能电子所引起的深层充放电现象是威胁航天器安全的重要因素之一。文章采用90Sr放射源模拟GEO电子环境,试验观测了电子辐照下几种含有悬浮导体的典型卫星模拟部件结构的深层充放电现象,比较了真空度、束流密度与温度对放电现象的影响。试验结果表明,深层放电现象的产生与部件结构密切相关,在一定环境条件下含有悬浮导体的结构即可产生放电现象。因此,航天器深层放电防护除了选择合适的介质材料外,要尽可能地避免悬浮导体的存在,同时还必须考虑真空度和温度的影响。
Space radiation environment, caused by high-energy electrons deep charge and discharge phenomenon is one of the important threats to the safety of spacecraft. In this paper, the 90Sr radioactive source was used to simulate the GEO electronic environment. The deep charge and discharge phenomena of several typical satellite simulation components with suspended conductors under electron irradiation were observed. The effects of vacuum degree, beam density and temperature on the discharge were compared. The experimental results show that the phenomenon of deep discharge is closely related to the structure of parts, and the discharge phenomenon can be generated by the structure containing suspended conductor under certain environmental conditions. Therefore, the deep discharge protection of spacecraft in addition to select the appropriate dielectric materials, as far as possible to avoid the presence of suspended conductors, but also must take into account the impact of vacuum and temperature.