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Next Generation Small Satellite-1 (NEXTSat-1) is scheduled to launch in 2017 and Instruments for the Study of Space Storm\ud(ISSS) is planned to be onboard the NEXTSat-1. High Energy Particle Detector (HEPD) is one of the equipment comprising\udISSS and the main objective of HEPD is to measure the high energy particles streaming into the Earth radiation belt during\udthe event of a space storm, especially, electrons and protons, to obtain the flux information of those particles. For the\uddesign of HEPD, the Geometrical Factor was calculated to be 0.05 to be consistent with the targets of measurement and\udthe structure of telescope with field of view of 33.4° was designed using this factor. In order to decide the thickness of the\uddetector sensor and the classification of the detection channels, a simulation was performed using GEANT4. Based on the\udsimulation results, two silicon detectors with 1 mm thickness were selected and the aluminum foil of 0.05 mm is placed\udright in front of the silicon detectors to shield low energy particles. The detection channels are divided into an electron\udchannel and two proton channels based on the measured LET of the particle. If the measured LET is less than 0.8 MeV,\udthe particle belongs to the electron channel, otherwise it belongs to proton channels. HEPD is installed in the direction of\ud0°,45°,90° against the along-track of a satellite to enable the efficient measurement of high energy particles. HEPD detects\udelectrons with the energy of 0.1 MeV to several MeV and protons with the energy of more than a few MeV. Thus, the study\udon the dynamic mechanism of these particles in the Earth radiation belt will be performed

Development of High Energy Particle Detector for the Study of Space Radiation Storm