Chuan Yue

A parameterized energy correction method for electromagnetic showers in BGO-ECAL of DAMPE

Abstract DAMPE is a space-based mission designed as a high energy particle detector measuring cosmic-rays and γ -rays which was successfully launched on Dec.17, 2015. The BGO electromagnetic calorimeter is one of the key sub-detectors of DAMPE for energy measurement of electromagnetic showers produced by e ± / γ . Due to energy loss in dead material and energy leakage outside the calorimeter, the deposited energy in BGO underestimates the primary energy of incident e ± / γ . In this paper, based on detailed MC simulations, a parameterized energy correction method using the lateral and longitudinal information of electromagnetic showers has been studied and verified with data of electron beam test at CERN. The measurements of energy linearity and resolution are significant improved by applying this correction method for electromagnetic showers.

An algorithm to resolve γ-rays from charged cosmic rays with DAMPE

The DArk Matter Particle Explorer (DAMPE), also known as Wukong in China, launched on December 17, 2015, is a new high energy cosmic ray and {\gamma}-ray satellite-borne observatory in space. One of the main scientific goals of DAMPE is to observe GeV-TeV high energy {\gamma}-rays with accurate energy, angular, and time resolution, to indirectly search for dark matter particles and for the study of high energy astrophysics. Due to the comparatively higher fluxes of charged cosmic rays with respect to {\gamma}-rays, it is challenging to identify {\gamma}-rays with sufficiently high efficiency minimizing the amount of charged cosmic ray contamination. In this work we present a method to identify {\gamma}-rays in DAMPE data based on Monte Carlo simulations, using the powerful electromagnetic/hadronic shower discrimination provided by the calorimeter and the veto detection of charged particles provided by the plastic scintillation detector. Monte Carlo simulations show that after this selection the number of electrons and protons that contaminate the selected {\gamma}-ray events at

Measurement of absolute energy scale of ECAL of DAMPE with geomagnetic rigidity cutoff

\sim10

Charge measurement of cosmic ray nuclei with the plastic scintillator detector of DAMPE

GeV amounts to less than 1% of the selected sample. Finally, we use flight data to verify the effectiveness of the method by highlighting known {\gamma}-ray sources in the sky and by reconstructing preliminary light curves of the Geminga pulsar.

Studies of Cosmic-Ray Proton Flux with the DAMPE Experiment

In this paper, we developed a method to determine absolute energy scale of DAMPE via measuring geomagnetic cutoff on cosmic ray electron and positron spectrum. The rigidity cutoff on cosmic ray electron and positron was calculated using IGRF-12 model and cosmic ray particle trajectory tracing code developed by Smart and Shea. Then we also measured cosmic ray electron and positron spectrum in MacIlwain L bin [1,1.14] based on over 425 days flight data of DAMPE. By directly comparing calculated geomagnetic cutoff with DAMPE measured result, we provide an estimation on absolute energy scale of DAMPE

Determination of the South Atlantic Anomaly from DAMPE data

1.25\%

The performance of DAMPE for gamma-ray detection

higher than expected at about 13GeV energy with uncertainty about

3FGL J1924.8-1034: A spatially extended stable unidentified GeV source?

\pm1.75\%(stat)\pm1.34\%(sys)

A study of temperature effects on MIP of BGO calorimetersof DAMPE

.

Temperature effects on MIPs in the BGO calorimeters of DAMPE

One of the main purposes of the DArk Matter Particle Explorer (DAMPE) is to measure the cosmic ray nuclei up to several tens of TeV or beyond, whose origin and propagation remains a hot topic in astrophysics. The Plastic Scintillator Detector (PSD) on top of DAMPE is designed to measure the charges of cosmic ray nuclei from H to Fe and serves as a veto detector for discriminating gamma-rays from charged particles. We propose in this paper a charge reconstruction procedure to optimize the PSD performance in charge measurement. Essentials of our approach, including track finding, alignment of PSD, light attenuation correction, quenching and equalization correction are described detailedly in this paper after a brief description of the structure and operational principle of the PSD. Our results show that the PSD works very well and almost all the elements in cosmic rays from H to Fe are clearly identified in the charge spectrum