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Dead cell and side leakage correction for a lead-scintillating fiber electromagnetic calorimeter

Chinese Physics C 2016年第9期40卷 133-137页

作者：张诚李祖豪唐志成 Suzan Basegmez du Pree 张劭文王薛强杨民陈国明陈和生 Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

The electromagnetic calorimeter（ECAL） of the Alpha Magnetic Spectrometer（AMS-02） is one of the key detectors for dark matter searches. It measures the energies of electrons, positrons and photons and seperates them from hadrons. Currently, there are 5 dead cells in the ECAL, which affect the reconstructed energy of 4.2%of total events in the ECAL acceptance. When an electromagnetic shower axis is close to the ECAL border, due to the side leakage, the reconstructed energy is affected as well. In this paper, methods for dead cells and side leakage corrections for the ECAL energy reconstruction are presented. For events with the shower axis crossing dead cells,applying dead cell correction improves the difference in the reconstructed energy from 12% to 1%, while for events near the ECAL border, with side leakage correction it is improved from 4% to 1%.

关键词： AMS-02 ECAL dead cell correction side leakage correction

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Improvements on the particle identification with dead cell and side leakage corrections for the electromagnetic calorimeter of the Alpha Magnetic Spectrometer

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Radiation Detection Technology and Methods 2018年第2期2卷 14-18页

作者： Shao-Wen Zhang Zu-Hao Li Xue-Qiang Wang Cheng Zhang Zhi-Cheng Tang Suzan Basegmez du Pree Fei Zhao Ze-Tong Sun Guo-Ming Chen He-Sheng Chen Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of ScienceBeijing 10049China University of Chinese Academy of Sciences Beijing 100049China

Background The electromagnetic calorimeter(ECAL)of the Alpha Magnetic Spectrometer(AMS-02)measures the energy of electrons/positrons and separates them from ***,there are five dead cells in the ECAL which affect the reconstructed energy of *** particle identification power of the ECAL decreases when particles pass through these dead cells or close to the ECAL *** To improve the ECAL particle identification for particles pass through these dead cells or close to the ECAL *** An improved ECAL particle identification estimator using the electromagnetic shower shape is developed with dead cell and side leakage *** For events passing through dead cells,with this new estimator,the proton rejection power is improved by a factor of 2.2 and positron purity is improved from 31 to 50%in the energy range of 500–800 *** The new estimator works well for event passing through dead cells or close to the ECAL border.

关键词： Electron/proton separation Electromagnetic calorimeter(ECAL) Boosted Decision Trees(BDT) Dead cell correction side leakage correction

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