Geometrical reconstruction of fluorescence events observed by the LHAASO experiment

• 作 者: F.Aharonian Q.An Axikegu L.X.Bai Y.X.Bai Y.W.Bao D.Bastieri X.J.Bi Y.J.Bi H.Cai
• 机 构: Dublin Institute for Advanced Studies, 31 Fitzwilliam Place, 2 Dublin, Ireland;Max-Planck-Institut f
• 出 处: 中国物理C（英文版）
• 发表日期: 2021年4期
• 关键词: cosmic ray fluorescence telescope stereo observation geometrical reconstruction

The LHAASO-WFCTA experiment,which aims to observe cosmic rays in the sub-EeV range using the fluorescence technique,uses a new generation of high-performance telescopes.To ensure that the experiment has excellent detection capability associated with the measurement of the energy spectrum,the primary composition of cosmic rays,and so on,an accurate geometrical reconstruction of air-shower events is fundamental.This paper describes the development and testing of geometrical reconstruction for stereo viewed events using the WFCTA (Wide Field of view Cherenkov/Fluorescence Telescope Array) detectors.Two approaches,which take full advantage of the WFCTA detectors,are investigated.One is the stereo-angular method,which uses the pointing of triggered SiPMs in the shower trajectory,and the other is the stereo-timing method,which uses the triggering time of the fired SiPMs.The results show that both methods have good geometrical resolution;the resolution of the stereo-timing method is slightly better than the stereo-angular method because the resolution of the latter is slightly limited by the shower track length.