Simulation and photoelectron track reconstruction of soft X-ray polarimeter

Simulation and photoelectron track reconstruction of soft X-ray polarimeter
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软X射线旋光计的模拟与光电子轨迹重建

DOI:
10.1007/s41365-021-00903-0
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发表时间:
2021-07
影响因子:
2.8
通讯作者:
Liang Enwei
Liang Enwei
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Huang Xuefeng;Liu Hongbang;Zhang Jin;Huang Bo;Xie Wenjin;Feng Huanbo;Cai Xichen;Liu Xiwen;Li Zili;Gu Jianyu;Liu Qian;Li Jin;Liang Enwei

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软X射线旋光仪(SXP)是一种能量范围宽、面积大、视场大的探测器。SXP将安装在中国空间站上,主要侧重于探测瞬态软X射线(2-10 keV)源的偏振,特别是伽马射线爆发(GRB)。本文以旋光仪探测器单元为例,利用Geant 4和加菲猫++软件对探测效率和航迹产生进行了仿真。提出了一种改进的航迹重建算法,并将其用于航迹的二维图像重建。在该方法中,通过缩短或延长轨道的初始部分,直到剩余的轨道是直的,并且像素数在可调阈值内,从轨道的初始部分重构光电子的初始发射角。在7-10 keV的光子能量范围内,重构后的光电子轨道的调制因子达到约57%。
The soft X-ray polarimeter (SXP)is a detector with a wide energy range, large area, and large field of view. A SXP will be mounted on the Chinese Space Station and will mainly focus on detecting the polarization of transient soft X-ray (2-10 keV)sources, especially gamma-ray bursts (GRBs). In this work, a polarimeter detector unit is taken as an example, and Geant4 and Garfield++ software are used to simulate the detection efficiency and track production. An improved track reconstruction algorithm is proposed and used to reconstruct two-dimensional images of the tracks. In this method, the initial emission angle of photoelectrons is reconstructed from the initial part of the track by shortening or extending the initial part of the track until the remaining track is straight, and the number of pixels is within an adjustable threshold. The modulation factor of the photoelectronic tracks after reconstruction reaches approximately 57% in the photon energy range of 7-10 keV.
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