B型CATCH卫星在轨背景模拟
天体物理仪器与方法
2023-07-24 v2 高能物理 - 实验
摘要
追逐所有暂现源星座猎手（CATCH）空间任务计划发射三类微卫星（A、B与C）。B型CATCH卫星专用于暂现源定位及其随时间变化的能谱探测。B型卫星配备轻量Wolter-I X射线光学系统与位置敏感多像素硅漂移探测器阵列。为优化科学载荷以在轨正常运行并高灵敏度观测，本工作使用Geant4工具包对B型CATCH卫星进行在轨背景模拟。结果表明，持久背景由宇宙X射线弥漫背景与宇宙线质子主导。还估算了动态背景，考虑辐射带中被俘获带电粒子与近地磁赤道低能带电粒子，其由孔径外入射电子主导。焦斑内模拟持久背景用于估算观测灵敏度，即曝光10 s、Crab类源谱下4.2210 erg cm s，可进一步用于优化屏蔽设计。模拟在轨背景还表明，光学系统正下方的磁偏转器在此类微卫星中或可不必要，因为孔径外带电粒子引发的动态背景约为孔径内者的3个数量级之大。
引用
@article{arxiv.2305.08589,
title = {In-orbit background simulation of a type-B CATCH satellite},
author = {Jingyu Xiao and Liqiang Qi and Shuang-Nan Zhang and Lian Tao and Zhengwei Li and Juan Zhang and Xiangyang Wen and Qian-Qing Yin and Yanji Yang and Qingcui Bu and Sheng Yang and Xiaojing Liu and Yiming Huang and Wen Chen and Yong Yang and Huaqiu Liu and Yibo Xu and Shujie Zhao and Xuan Zhang and Panping Li and Kang Zhao and Ruican Ma and Qingchang Zhao and Ruijing Tang and Jinhui Rao and Yajun Li},
journal= {arXiv preprint arXiv:2305.08589},
year = {2023}
}
备注
24 pages, 13 figures, 7 tables, accepted for publication in Experimental Astronomy