On-orbit calibration and long-term performance of the DAMPE trigger system

arXiv - PHYS - Instrumentation and Detectors Pub Date : 2024-09-05 DOI:arxiv-2409.03352

Wen-Hao LiPurple Mountain Observatory, Chinese Academy of Sciences, NanjingSchool of Astronomy and Space Science, University of Science and Technology of China, Hefei, Chuan YuePurple Mountain Observatory, Chinese Academy of Sciences, Nanjing, Yong-Qiang ZhangPurple Mountain Observatory, Chinese Academy of Sciences, Nanjing, Jian-Hua GuoPurple Mountain Observatory, Chinese Academy of Sciences, NanjingSchool of Astronomy and Space Science, University of Science and Technology of China, Hefei, Qiang YuanPurple Mountain Observatory, Chinese Academy of Sciences, NanjingSchool of Astronomy and Space Science, University of Science and Technology of China, Hefei

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Abstract

The DArk Matter Particle Explorer (DAMPE) is a satellite-borne particle detector for measurements of high-energy cosmic rays and {\gamma}-rays. DAMPE has been operating smoothly in space for more than 8 years since launch on December 17, 2015. The trigger logic of DAMPE is designed according to the deposited energy information recorded by the calorimeter. The precise calibration of the trigger thresholds and their long-term evolutions are very important for the scientific analysis of DAMPE. In this work, we develop a new method for the threshold calibration, considering the influence from the electronic noise, and obtain the long-term evolutions of the trigger thresholds. The average increase rate of the trigger thresholds for the first 4 layers of the calorimeter is found to be about 0.9% per year, resulting in variations of the high-energy trigger efficiency of cosmic ray electrons by about -5% per year at 2 GeV and less than about -0.05% above 30 GeV.

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DAMPE 触发系统的在轨校准和长期性能

DArk物质粒子探测器（DAMPE）是一个用于测量高能宇宙射线和{伽马}射线的星载粒子探测器。自2015年12月17日发射以来，DAMPE已在太空平稳运行了8年多。DAMPE的触发逻辑是根据热量计记录的沉积能量信息设计的。触发阈值的精确校准及其长期演变对DAMPE的科学分析非常重要。在这项工作中，考虑到电子噪声的影响，我们开发了一种新的阈值校准方法，并获得了触发阈值的长期演变。结果发现，量热计前四层的触发阈值平均每年增加约0.9%，导致宇宙射线电子的高能触发效率在2 GeV时每年变化约-5%，在30 GeV以上则小于约-0.05%。

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arXiv - PHYS - Instrumentation and Detectors

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