A 4-inch silicon/tungsten calorimeter for [formula omitted] collider experiments

Abstract

A 4-inch diameter silicon/tungsten sandwich calorimeter with 64 cm 2 in active area and 18 radiation lengths in depth has been constructed. The performance has been investigated for incoming electrons of 500 MeV to 4.5 GeV. The calorimeter shows a good linearity over the electron energy region and the energy resolution is well expressed by σ(rms)/ E = 17√ t/ E%, where t represents the unit sampling thickness in radiation lengths and E the incident electron energy in GeV. The agreement between these results and a Monte Carlo simulation is quite satisfactory. The center of shower has been determined with the accuracy of better than 2 mm at energies exceeding 1 GeV.