用蒙特卡罗方法研究质子在航天器内部充电中的作用  

Study on the Effects of Protons to Spacecraft Internal Charging With Monte Carlo Method

作　　者：田天[1,2] 焦维新[2] 陈旭[3] 李珑[1] 万应虎[1] 魏雅利[1] 

机构地区：[1]中国人民解放军61741部队 [2]北京大学空间物理与应用技术研究所 [3]解放军理工大学气象学院

出　　处：《空间科学学报》2011年第1期93-99,共7页Chinese Journal of Space Science

基　　金：国家自然科学基金项目资助(40674097)

摘　　要：介绍了航天器内部充电的基本物理机制,重点研究了质子在内部充电中的作用.用蒙特卡罗方法模拟质子在介质中的输运过程,计算了简化的平板介质在一定通量的粒子环境中的内部充电情况.结果表明,介质内部最大电场与入射质子能量有关,当质子能量达到14MeV时候,内部电场最强;当质子与电子的入射数目相同,并且材料参数一样时,质子产生的最大电场大于电子产生的最大电场.选取2004年7月26日TC-2卫星姿控分系统故障前的质子和电子通量数据,分别计算了二者可能引起的内部最大电场.计算结果表明,质子产生的最大电场比电子产生的最大电场小2～4个数量级,并且远小于击穿电场;在某些极端情况下,例如质子产生的电场和电子产生的电场方向一致的时候,电场的叠加会使局地电场得到加强.In this paper,the basic mechanism of spacecraft internal charging was introduced,and proton＇s effect on internal charging was mainly studied.Monte Carlo method is used to simulate the transporting process of proton in dielectric and the internal charging results in certain flux environment for the case of simple plane dielectric were calculated.Results indicate that the maximum electric field is correlated with the energy of the inject protons,and the electric field reached its maximum value under certain energy;that for the same number of injected particles and the same material parameters,the maximum electric field produced by proton is much higher than that produced by electron.Proton and electron data on 26th July,2004,the time just before TC-2 satellite＇s attitude control system becomes invalid were chosen to calculate the internal maximum electric field produced by protons and electrons.The results reveal that the maximum electric field produced by protons is 2～4 magnitudes smaller than that produced by electrons,mainly due to proton＇s much smaller flux than that of electron.

关 键 词：内部充电 蒙特卡罗方法 质子 积分通量 最大电场 

分 类 号：P353[天文地球—空间物理学]