屏蔽材料对木星轨道卫星内部介质充电效应的影响研究  

Effect of shielding materials on satellite internal dielectric charging effects in Jupiter orbits

作　　者：于向前[1] 施伟红[1] 宋思宇 陈鸿飞[1] 宗秋刚[1] 邹鸿[1] 陈傲 王永福[1] YU Xiangqian;SHI Weihong;SONG Siyu;CHEN Hongfei;ZONG Qiugang;ZOU Hong;CHEN Ao;WANG Yongfu(School of Earth and Space Sciences,Peking University,Beijing 100871,China)

机构地区：[1]北京大学地球与空间科学学院,北京100871

出　　处：《中国空间科学技术》2021年第5期21-27,共7页Chinese Space Science and Technology

基　　金：北京市自然科学基金(木星轨道深层介质充电效应定量防护研究3184048,等离子体层电子与超低频波相互作用测试粒子模拟研究8201701137)。

摘　　要：在木星轨道的空间辐射环境中,占主导地位的粒子是能量大于1 MeV(甚至高于100 MeV)的高能电子,这可能会产生卫星内部介质充电效应。在卫星的防辐射设计中,通常需要一定厚度的材料来屏蔽这些电子,使得进入卫星内部的电子通量达到安全的水平。利用所建立的GEANT4-RIC(radiation induced conductivity)方法,研究了运行于木星轨道的卫星对高能电子的最佳屏蔽材料设计。研究了铝、钛、铁、铜、钽和铅作为卫星屏蔽材料的可能性。研究结果表明,在木星探测任务中,为了减轻卫星内部介质充电效应,高原子序数材料比低原子序数材料在相同质量下提供的屏蔽效果更好。因此,用钛、铁、铜、钽或铅代替地球轨道卫星上常用的屏蔽材料铝,可以节省屏蔽质量。In the space environment around Jupiter,the dominant particles are high-energy electrons with E>1 MeV(and can be higher than 100 MeV),which can cause internal dielectric charging effects in spacecraft electronics.Huge mass is required to shield these electrons to reduce the incident internal flux to a safe level.The GEANT4 and RIC(radiation-induced conductivity)Monte Carlo toolkit method was used to study an optimum single shielding material design for high energy electrons during a Jupiter mission.Al,Ti,Fe,Cu,Ta and Pb were investigated as possible materials for spacecraft shielding.Calculation results indicate that,to mitigate internal dielectric charging effects during a Jupiter mission,low-Z materials provide less-efficient shielding with the same areal mass than high-Z materials.Therefore,shielding mass can be saved by using Ti,Fe,Cu,Ta or Pb,instead of Al which is commonly used in Earth orbits.

关 键 词：木星轨道 卫星内部介质充电效应 屏蔽材料 充电电场 充电电势 空间辐射 

分 类 号：V416[航空宇航科学与技术—航空宇航推进理论与工程]