A fine grain gas ionization calorimeter

Abstract The characteristics of a gas ionization calorimeter with planar electrode geometry have been studied in hadron and electron beams with momenta from 19 to 50 GeV/ c . The calorimeter was filled with a 95% Ar + 5% CF 4 gas mixture. Absorbers were made of uranium and steel. The dependencies of energy resolution on gas pressure and absorber thickness are presented. The signal-to-noise and electron-to-hadron ratios are discussed.