Speaker
Description
The DArk Matter Particle Explorer (DAMPE) is a space-borne experiment that indirectly searches for dark matter by measuring the high-energy cosmic ray electrons/positrons (CREs) and gamma rays. The key sub-detector of DAMPE is the Electromagnetic CALorimeter (ECAL), which is designed for precise energy measurement with a large dynamic range from 5 GeV to 10 TeV. The ECAL consists of 308 Bismuth Germanium Oxide (BGO) crystals with dimensions of 2.5 cm × 25 cm × 60 cm. Since its launch at the end of 2015, DAMPE has been operating smoothly for over 9 years, getting a significant dataset of CREs exceeding TeV energies. In this work, we introduce a new calibration method for the high dynamic range of the BGO calorimeter specifically for the TeV CREs, thereby optimizing the energy measurement for individual events. In addition, we study the behavior of CREs beyond TeV energies in the BGO calorimeter, focusing on their high-energy electromagnetic shower development, including the lateral shower shape and the longitudinal shower shape. We also demonstrate the study of the e/p separation capability beyond TeV energy range using shower development, which plays a major role in the DAMPE experiment to measure the cosmic ray electron flux accurately.
| Collaboration(s) | DAMPE Collaboration |
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