Abstract
The High-Energy Particle Detector (HEPD) is an instrument devoted to the measurement of cosmic particles from few MeV up to hundreds of MeV. The HEPD will contribute to the China Seismo-Electromagnetic Satellite mission by measuring the precipitation of trapped particles and by studying the solar-terrestrial environment especially during impulsive events like coronal mass ejections and solar energetic particle emissions. A Monte Carlo software was realized to study the performance of HEPD, such as its particle discrimination capability, the energy threshold for trigger and the maximum energy detectable in full containment. This contribution reports the main features of the HEPD Monte Carlo simulation and some results of the detector performance based on it. A comparison with beam tests was carried out, showing a good agreement with the simulation.
Highlights
The High-Energy Particle Detector (HEPD) is an instrument devoted to the measurement of cosmic particles from few MeV up to hundreds of MeV
The HEPD was developed by the Italian “Limadou” collaboration in the framework of the ChineseItalian CSES mission
A veto system based on a set of plastic scintillators rejects events that are not fully contained in the calorimeter
Summary
The HEPD was developed by the Italian “Limadou” collaboration in the framework of the ChineseItalian CSES mission. The detector will range the low-energy component of cosmic rays, and in particular electrons in the range 3 - 100 MeV, protons in the range 30 - 300 MeV and light nuclei It is composed by several subdetectors, arranged as shown, left: a tracker, with 2 planes of double-sided silicon microstrip detectors; a trigger plane, formed by 6 plastic scintillator paddles; a range-calorimeter, a tower of 16 plastic scintillator planes and a 3 × 3 matrix of inorganic scintillator (LYSO); with the tracker/trigger plane it is used for the particle identification and the energy reconstruction. HEPD is installed on board the CSES satellite, a scientific mission dedicated to monitor electromagnetic field and waves, plasma and particles perturbations of the atmosphere, ionosphere and magnetosphere induced by natural sources and anthropocentric emitters [1] and to study their correlations with the occurrence of seismic events [2][3]. Data collected by the mission will allow studying solar-terrestrial interactions and cosmic ray solar modulation, with particular regard to particle spectra of the 24th and 25th solar cycle
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