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.

空间环境中的带电粒子可能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分流器，以使带电粒子偏离敏感的检测区域。在这项工作中，我们在增强的X射线定时和极化（eXTP）天文台上进行了磁转向器的初步设计。它依靠GEANT4工具包的蒙特卡罗方法来模拟对带电粒子的反射镜响应，对电子使用单一散射物理学，对质子使用弹性雷米佐维奇物理学。它还实现了一种数值方法来计算由永久磁铁组件产生的磁场及其对带电粒子轨迹的影响。