Calibration of the Medium Energy Proton Detector of FY-3E

FY-3E is the first satellite among the FY-3 series that has observed protons with medium energy in multiple directions. The medium energy proton detector can measure the energy spectrum of protons with the energy range of 0.03~5 MeV in nine directions. In order to determine the actual performance of the medium energy proton detector, before the instrument delivered, the energy resolution, relative response efficiency curve, measurement consistency of probes in different directions, and anti-electron pollution ability of the medium energy proton detector were calibrated using the medium and high-energy electron accelerator of the National Space Science Center of the Chinese Academy of Sciences. This paper introduces the calibration site and contents of the instrument, and analyzes the calibration results. The results show that the energy resolution of the instrument is 6.50% @ 310 keV, the consistency deviation of each measurement is better than 1.51%, and the probability of electronic pollution counting in the instrument is less than 1%.The results provide an important reference for the analysis and processing of the data of the intermediate-energy proton detector in orbit.