Test Beam Performance Of The Electromagnetic Calorimeter Of The Nomad Experiment

Test beam results of the NOMAD electromagnetic calorimeter are presented showing linearity, signal uniformity, energy and position resolution measured in an electron beam. Tests were also performed placing the calorimeter in a magnetic field of 0.4 T . Results on the ß rejection obtained using a combined measurement of preshower/electromagnetic calorimeter are found to be in good agreement with the project expectations. Finally the calorimeter response to the muons is discussed . Preprint submitted to Nuclear Instruments & Methods in Physics Research 1 Introduction The main goal of the NOMAD experiment is to search for the appearance of tau neutrinos, ø . The detector is located in the CERN West Area and is exposed to the SPS neutrino wide band beam [1]. The NOMAD detector was designed to measure and identify the electrons, muons, photons and hadrons produced in neutrino interactions. The active target consists of 132 planes of drift chambers located in a magnetic field of 0:4 T whi..