Time and Energy Resolutions of Electromagnetic Calorimeter Prototypes Based on Lead Tungstate Crystals
Instruments and Experimental Techniques（2023）
National Research Centre Kurchatov Institute
Abstract
— The time and energy resolutions were measured for four prototypes of the PHOS electromagnetic calorimeter for the ALICE experiment at the Large Hadron Collider at CERN. Each prototype was made up of nine identical detection elements assembled as a 3 × 3 array. The detection element was based on a lead tungstate (PbWO 4 ) scintillating crystal with a length of 180 mm and a cross section of 22 × 22 mm 2 , which was viewed from its end face by a photodetector. Avalanche photodiodes and silicon photomultipliers with different active areas (Hamamatsu, Japan) were used as photodetectors. The measurements were made with the electron component of secondary particle beams of the PS proton synchrotron at CERN in the momentum range of 1−10 GeV/ c at a temperature of 17.5°C.
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