| Recent researchers shows that the ordinary matter only account for about 4.9percent of all the mass and energy in the Universe,26.8 percent is the dark matter,and another 68.3 percent is dark energy.Fritz Zwicky,an astronomer at the California Institute of Technology,has proposed the hypothesis of dark matter in the early 1930 s.It has been more than 80 years and many models are proposed to explain the dark matter.Experimental physicists are trying their best to search the evidence of dark matter.The most popular and hopeful candidate is WIMPs whose decay products could be detected.Many experiments are designed based on WIMPs including the DAMPE.The DAMPE is a spaceborne device which is planned and projected by Chinese physical scientist.It works well for more than one year since its launching on December 17,2015.The DAMPE search for dark matter particles by detecting the high energy gamma-rays and high energy electrons,and it has the widest energy range and the best resolution compared with others spaceborne devices.The DAMPE is a multi-functional detector which could detect nuclei for Z = 1to Z = 26,this function is realized by the Plastic Scintillator Detector(PSD).It is one of the four sub-detectors,projected by the Institute of Modern Physics(IMP)of the Chinese Academy of Sciences.The PSD could also be used as a veto detector to discriminate the gamma-rays from the electrons.This thesis focuses on the process of the PSD calibration using the orbit data,including the pedestal calibration,dynode ratios,MIPs response and so on.After the energy deposition of the incident charged particles in the PSD was calibrated,further energy corrections were executed.We studied the algorithm of charge reconstruction based on the PSD and got the charge of cosmic-rays.Only a fewdata were used to reconstruct the charge spectrum in this thesis because the thesis focused on the reconstruction algorithm.The resolution of charge spectrum also indicated the accuracy and precision of the energy reconstruction based on the PSD. |
