Construction and beam test of a small compact electromagnetic PbWO4 calorimeter

摘要

A compact homogenous electromagnetic calorimeter with an energy resolution of better than 5/rootE/GeV, made out of lanthanum-doped lead tungstate crystals from Bogoroditsk, Russia, has been built for use in the ZEUS detector. The whole calorimeter, composed of 4 x 4 crystals, each of dimensions 23.8 x 23.8 x 200 mm(3), light guides and photomultipliers, fits into a space of 12 x 12 x 27 cm(3). Beam tests with electrons up to 100 GeV showed an energy resolution of better than 4.9/rootE/GeV, a linearity of better than 1 and a position resolution of 1.1 mm. The influence of temperature variations and recovery of an irradiated crystal on the total energy signal could be corrected to better than 1. EGS4 simulations reproduce the results very well. (C) 2001 Elsevier Science B.V. All rights reserved. References: 22