Abstract
The DArk Matter Particle Explorer (DAMPE) space mission is designed to measure cosmic rays and gamma rays. The key sub-detector of DAMPE is the Bismuth Germanium Oxide (BGO) Electromagnetic CALorimeter (ECAL), which measures the energies of electrons/gamma-rays ranging from 5 GeV–10 TeV. A laser test carried out to study the response of the BGO ECAL to up to ∼TeV energy deposition revealed that the BGO fluorescence response retains linearity at laser energy deposition densities higher than that induced by a ∼10 TeV electromagnetic shower. The energy measurements obtained from on-orbit data were also compared with Monte Carlo simulation results. The present study confirms that there is no fluorescence quenching effect in the DAMPE BGO ECAL.
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