The boresight alignment of the DArk Matter Particle Explorer  

作　　者：Wei Jiang Xiang Li Kai-Kai Duan Zhao-Qiang Shen Zun-Lei Xu Jing-Jing Zang Shi-Jun Lei Qiang Yuan 

机构地区：[1]Key Laboratory of Dark Matter and Space Astronomy,Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210023,China [2]School of Astronomy and Space Science,University of Science and Technology of China,Hefei 230026,China [3]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Research in Astronomy and Astrophysics》2020年第6期223-228,共6页天文和天体物理学研究（英文版）

基　　金：founded by the strategic priority science and technology projects in space science of the Chinese Academy of Sciences(Nos.XDA04040000 and XDA04040400);supported in part by the National Key Program for Research and Development(No.2016YFA0400200);the National Basic Research Program(No.2013CB837000);the Strategic Priority Research Program of Chinese Academy of Sciences(CAS)"Multi-Waveband Gravitational Wave Universe”(No.XDB23040000);the Strategic Priority Research Program of CAS(No.XDB23040000);the Youth Innovation Promotion Association of CAS,the National Natural Science Foundation of China(Nos.U1738123 and U1631111);the 100 Talents program of Chinese Academy of Sciences and the Young Elite Scientists Sponsorship Program;support by the Swiss National Science Foundation(SNSF),Switzerland and the National Institute for Nuclear Physics(INFN),Italy。

摘　　要：The DArk Matter Particle Explorer(DAMPE)can measureγ-rays in the energy range from a few GeV to about 10 TeV.The direction of eachγ-ray photon is reconstructed in the DAMPE payload reference system.To convert this to celestial coordinates,we require the celestial orientation of the payload system,which,however,may slightly deviate from that of the satellite system provided by the star-tracker.In this paper,we adopt a maximum likelihood method and use theγ-rays centered around several bright point-like sources to measure and correct the angular deviations between the DAMPE payload and satellite system,the so-called"boresight alignment".We also check our method of boresight alignment for some sets of simulation data with artificial orientations and obtain consistent results.The time-dependent boresight alignment analysis does not show evidence for significant variation of the parameters.

关 键 词：INSTRUMENTATION detectors-gamma rays general-methods DATA 

分 类 号：P172.3[天文地球—天文学]