单能电子突增对地球同步轨道卫星聚酰亚胺介质的深层充电效应影响  

Effect of Monoenergetic Electron Enhancement on Deep Charging of Polyimide in Geosynchronous Orbit Satellites

作　　者：乌江 郅屹搏 王廷玉 张博[1,2] 尚鹏辉 曹雯 WU Jiang;ZHI Yibo;WANG Tingyu;ZHANG Bo;SHANG Penghui;CAO Wen(School of Electronics and Information,Xi’an Polytechnic University,Xi’an 710048,China;Xi’an Key Laboratory of Interconnected Sensing and Intelligent Diagnosis for Electrical Equipment,Xi’an 710048,China;Yangtze Delta Region Institute(Huzhou),University of Electronic Science and Technology of China,Huzhou 313000,China;School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安工程大学电子信息学院,西安710048 [2]西安市电气设备互联感知与智能诊断重点实验室,西安710048 [3]电子科技大学长三角研究院(湖州),湖州313000 [4]西安交通大学电气工程学院,西安710049

出　　处：《高电压技术》2024年第7期3182-3190,共9页High Voltage Engineering

基　　金：陕西省科技厅自然科学基础研究重点项目(2022JZ-35)。

摘　　要：地球同步轨道时常会发生某单一能量附近高能电子通量突增现象,大量电子注入导致航天器绝缘介质充电效应更加显著。为了更好地评估单能电子突增现象下地球同步轨道航天器介质内部充电水平,建立了3 mm厚平板聚酰亚胺三维模型,采用了一种高能电子辐射和电场数值计算的Geant4-COMSOL联合充电评估方法,分别获得了0.4、0.7、1.0与1.3 MeV这4种单能电子以及地球同步轨道FLUMIC电子能谱辐射下聚酰亚胺内部电荷沉积速率和辐射剂量率分布,同时计算了其内部电场强度和电位分布;将单能电子与FLUMIC能谱叠加,研究了叠加辐射环境下聚酰亚胺内部电场和电位分布,并通过电荷传输过程分析了辐射条件与材料特性对电场强度和电位的影响规律。结果表明,在特定绝缘结构下,0.7 MeV单能电子入射产生的电位最高;1.0 MeV单能电子入射产生的电场强度最高;当同步轨道发生单能电子突增现象时,1.0 MeV电子突增加强了电场强度,1.3 MeV电子削弱了电场强度,基于电荷传输过程解释了叠加辐射环境下的充电规律。研究表明,地球同步轨道下特定结构绝缘介质在发生单能电子突增时,注入电子会导致充电效应加强而产生最坏情况,而更高的电子能量反而穿透材料并提升介质电导率,有效地降低了材料内部电场。The enhancement of high-energy electrons flux near a mono-energy often occurs in geosynchronous orbit,and a large number of electrons injection leads to a more significant charging effect of spacecraft dielectric.To better evaluate the internal charging level of spacecraft dielectric in geosynchronous orbit under the mono-energetic electron enhance-ment phenomenon,a 3 mm-thick flat plate three-dimensional model of spacecraft media polyimide was established in this paper,and a Geant4-COMSOL joint charging evaluation method based on the numerical calculation of high-energy elec-tron radiation and internal electric field was adopted.The charge deposition rate and radiation dose rate distributions of polyimide under 0.4,0.7,1.0 and 1.3 MeV mono-energetic electrons and FLUMIC electronic environment energy spec-trum radiation in geosynchronous orbit were obtained,at the same time,the internal electric field strength and potential distribution were calculated.The mono-energetic electron and FLUMIC energy spectrum were superimposed to study the internal electric field and potential distribution of polyimide.The effects of radiation conditions and material properties on the potential and electric field were analyzed through charge transfer process.The results show that,under the specific in-sulation structure,0.7 MeV monoenergetic electron incidence generates the highest potential,while the electric field intensity generated by 1.0 MeV monoenergetic electron incident is the highest.When mono-energetic electron enhance-ment occurs in geosynchronous orbit,the 1.0 MeV electron enhancement increases the electric field intensity,but the 1.3 MeV electron weakens the electric field intensity.Based on the charge transfer process,the charging law under superposi-tion environment is explained.The study shows that,when the mono-energetic electron enhancement occurs in the insu-lating medium of a specific structure in the geosynchronous orbit,the injection of electrons will lead to the strengthening of the charging effect,which will

关 键 词：GEANT4 地球同步轨道 电子突增现象 聚酰亚胺 深层充电 电荷传输过程 

分 类 号：V474.2[航空宇航科学与技术—飞行器设计]