DAMPE塑料闪烁体探测器的一种准直方法
A Method of Alignment of the Plastic Scintillator Detector of DAMPE
摘要：
暗物质粒子探测器（DAMPE）的塑料闪烁探测器（PSD）设计用于测量宇宙射线电荷（Z），并作为伽马射线识别的否决探测器。为了充分利用PSD的电荷识别潜力，提高其对伽马射线事件的识别能力，我们提出了一种PSD探测器对准方法。考虑到移位和旋转对准校正，导出PSD条的体积中的给定轨道的路径长度。通过对角点通过事例和完全包含事例的能谱分析，得到了所有PSD条的位置移动和旋转，平均值分别约为1mm和0.0015弧度。为了验证对准方法，我们在探测器模拟中引入了PSD条的人工移位和旋转。这些移位和旋转参数可以通过对准过程成功地恢复。作为PSD对准程序的结果，PSD的电荷分辨率根据核从$4\%$提高到$8\%$。
英文摘要：
The Plastic Scintillator Detector (PSD) of the DArk Matter Particle Explorer (DAMPE) is designed to measure cosmic ray charge (Z) and to act as a veto detector for gamma-ray identification. In order to fully exploit the charge identification potential of the PSD and to enhance its capability to identify the gamma ray events, we develop a PSD detector alignment method. The path length of a given track in the volume of a PSD bar is derived taking into account the shift and rotation alignment corrections. By examining energy spectra of corner-passing events and fully contained events, position shifts and rotations of all PSD bars are obtained, and found to be on average about 1mm and 0.0015 radian respectively. To validate the alignment method, we introduce the artificial shifts and rotations of PSD bars in the detector simulation. These shift and rotation parameters can be recovered successfully by the alignment procedure. As a result of the PSD alignment procedure, the charge resolution of the PSD is improved from $4\%$ to $8\%$ depending on the nuclei.
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