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

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Cheng Zhang, Zu-Hao Li, Zhi-Cheng Tang, Suzan Basegmez du Pree, Shao-Wen Zhang, Xue-Qiang Wang, Min Yang, Guo-Ming Chen and He-Sheng Chen. Dead cell and side leakage correction for a lead-scintillating fiber electromagnetic calorimeter[J]. Chinese Physics C, 2016, 40(9): 096204. doi: 10.1088/1674-1137/40/9/096204
Cheng Zhang, Zu-Hao Li, Zhi-Cheng Tang, Suzan Basegmez du Pree, Shao-Wen Zhang, Xue-Qiang Wang, Min Yang, Guo-Ming Chen and He-Sheng Chen. Dead cell and side leakage correction for a lead-scintillating fiber electromagnetic calorimeter[J]. Chinese Physics C, 2016, 40(9): 096204.  doi: 10.1088/1674-1137/40/9/096204 shu
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Received: 2016-03-14
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    Supported by National Natural Science Foundation of China(11220101004)

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

    Corresponding author: Zu-Hao Li,
Fund Project:  Supported by National Natural Science Foundation of China(11220101004)

Abstract: 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%.

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