Abstract
The core of the High-Energy Particle Detector (HEPD) on board of the China Seismo-Electromagnetic Satellite (CSES) is a segmented calorimeter, which is composed with an upper tower of plastic scintillator counters and a bottom array of LYSO large crystals. Electrons with energy below 100MeV, protons and light nuclei, below few hundreds ofMeV/nucleon are fully contained within this calorimeter. Mainly the LYSO array (density 7.3 g/cm3, thickness around 29.2 g/cm2) extends the HEPD energy range, allowing those measurements (solar energetic particles, low-energy cosmic rays) which are more related to astroparticle physics topics. Two identical copies of HEPD, and then of its calorimeter, exist: the Flight (FM) and the Qualification (QM) models. While the FM has achieved the orbit on board of the CSES satellite in February 2018, the Qualification Model, is used, at ground, for tests and calibrations. A report on the characterization of this compact particle space detector and on preliminary studies and results, will be given.
Highlights
The core of the High-Energy Particle Detector (HEPD) on board of the China Seismo-Electromagnetic Satellite (CSES) is a segmented calorimeter, which is composed with an upper tower of plastic scintillator counters and a bottom array of LYSO large crystals
While the Flight model (FM) has achieved the orbit on board of the CSES satellite in February 2018, the Qualification Model, is used, at ground, for tests and calibrations
The core of HEPD consists of a segmented calorimeter, which is divided in two sections
Summary
The core of HEPD consists of a segmented calorimeter, which is divided in two sections. Each counter measures 150×150×10 mm , and is read out by two PMTs at two opposite corners.The lower calorimeter consists of an array of 3×3 crystals of heavy inorganic scintillator (LYSO, density 7.3 g/cm). Each crystal has dimensions 48×48×40 mm and is read out by one PMT This array is located at the bottom of the tower. Another fraction of particles pass through the calorimeter and exit from the bottom veto. For these passing through particles it is possible to measure the differential energy loss within each calorimeter element, and a study of the event is possible with a comparison with an energy deposition model (passing through analysis)
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