DAMPE Plastic Scintillator Detector Calibration And Proton Flux Measurement

Astronomical observations show that there is dark matter in the Universe.According to particle physics and the field theory,dark matter is composed of dark matter particles.The dark matter particle is not a standard model particle,which has been a new black cloud in physics field in the 21 th century.The theory points out the dark matter particles may decay or annihilation via weak interaction to standard model particles.These products would mix with cosmic ray which is generated by astrophysics processes.Precisely measuring the flux of e±,?,p± is important to constrain the key properties of dark matter particles(like mass and decay width),Meanwhile,it is also important for studying the mechanism cosmic-ray acceleration and propagation.DArk Matter Particle Explorer(DAMPE)is the Strategic Pioneer Program on Space Satellite Science of the Chinese Academy of Science.Comparing with the same kind of projects,DAMPE can cover high energy range,and it has better energy resolution.The overall performance of DAMPE has reached world class level.DAMPE can measure cosmic-ray ?,e and nucleis flux precisely.This thesis is based on the orbit data of DAMPE,which includes three parts:(1)DAMPE PSD calibration.It includes PSD temperature and voltage stability analysis,pedestal calibration,dynode calibraton,response of MIPs,PSD energy reconstrucion,PSD light attenuation calibration,PSD hit positon self-reconstrution performance.We found that PSD performance is basically stable since the satellite launched.In PSD efficiency evaluation,we found that the efficiency of each PSD bar is above 99.8%,the total efficiency of the PSD is above 99.99%.(2)Developped of a PSD charge reconstrution algorithm.We have developed track selection algorithm and charge reconstruction algorithm based on the data after the calibration.With this algorithm,we found that PSD can identify cosmic-ray nucleis from H to Ni.The charge resulotion of PSD is comparable to other reconstructing the cosmic-ray space satellite experiments like AMS02.(3)Proton flux.It includes proton events selection,the calculation of efficiency acceptance,energy unfolding and a very first proton flux is obtained.