A preliminary design of the magnetic diverter on-board the eXTP observatory
A preliminary design of the magnetic diverter on-board the eXTP observatory
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DOI：
10.1007/s10686-021-09707-x
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发表时间：
2021-03
影响因子：
3
通讯作者：
L. Qi;Gang Li;Yupeng Xu;Yong Chen;Huilin He;Yusa Wang;Yanji Yang;Juan Zhang;F. Lu
中科院分区：
文献类型：
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作者：
L. Qi;Gang Li;Yupeng Xu;Yong Chen;Huilin He;Yusa Wang;Yanji Yang;Juan Zhang;F. Lu
太空环境中的带电粒子会降低天文望远镜中 X 射线探测器的科学性能。一种有效的对策是在光学器件的出射光瞳处放置一个磁偏转器，以使带电粒子偏转远离敏感检测区域。在这项工作中，我们对增强型 X 射线定时和偏振 (eXTP) 天文台上的磁分流器进行了初步设计。它依靠 GEANT4 工具包的蒙特卡罗方法来模拟镜像对带电粒子的响应，使用电子的单散射物理学和质子的弹性雷米佐维奇物理学。它还采用数值方法来计算永磁体组件产生的磁场及其对带电粒子轨迹的影响。紧凑的计算方案可以在特定辐射环境下有效地进行背景水平估计，从而能够根据科学要求验证分流器配置。
Charged particles in the space environment can degrade the scientific performances of X-ray detectors in astronomical telescopes. An efficient countermeasure is to place a magnetic diverter at the exit pupil of optics to deflect charged particles away from the sensitive detection area. In this work, we have performed a preliminary design of the magnetic diverter on-board the enhanced X-ray Timing and Polarimetry (eXTP) observatory. It relies on a Monte Carlo method via the GEANT4 toolkit to simulate the mirror responses to charged particles, using the single scattering physics for electrons and the elastic Remizovich physics for protons. It also implements a numerical method to calculate magnetic fields generated by an assembly of permanent magnets and its impact on the trajectories of charged particles. The compact calculation scheme provides efficient access to the background level estimation given the certain radiation environment, which enables the verification of the diverter configuration with the scientific requirements.