暗物质粒子探测卫星PSD的在轨状态以及PSD的光衰减行为研究

摘要

The DArk Matter Particle Explorer (DAMPE) is a high-resolution multi-purpose space-borne device for detecting the high-energy cosmic-rays like e±, γ-rays, protons, and heavy-ions, which was launched on 2015 December 17th. The Plastic Scin-tillator Detector (PSD) is the top-most sub-detector of DAMPE. The PSD is designed to measure the charge of incident high-energy particles, and to serve as a veto detector for discriminatingγ-rays from the charged particles. In this paper, the on-orbit status of the PSD after launching in terms of high voltage (HV) and temperature stabilities is presented. The temperature and the HV variations of the PSD are less than 1?C and 0.5%, respectively. By using the on-orbit data, the attenuation lengths of PSD bars are obtained according to an empirical formula. A preliminary charge spectrum reconstructed from the X-layer of the PSD is obtained.%暗物质粒子探测卫星(DArk Matter Particle Explorer,简称DAMPE)是一颗高分辨多功能的空间探测器,主要用来测量宇宙射线中的高能电子(正电子)、质子、伽玛射线和重离子,卫星已于2015年12月17日发射升空.塑料闪烁体探测器(Plastic Scintillator Detector,简称PSD)是DAMPE的子探测器,位于DAMPE的最上方.主要介绍DAMPE在轨期间PSD的相关内容,包括电压和温度状态,其中PSD的温度变化小于1?C,每个光电倍增管的电压变化小于0.5%.利用卫星传回的数据,研究了PSD晶体内的光衰减行为,根据经验公式得到每条PSD晶体的光衰减长度,利用PSD得到了初步的宇宙射线电荷谱.