Rs. Kessler et al., BEAM TEST OF A PROTOTYPE CSI CALORIMETER, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 368(3), 1996, pp. 653-665
A prototype electromagnetic calorimeter for the KTeV experiment at Fer
milab was tested at the CERN X1 beam-line. The calorimeter consisted o
f undoped cesium iodide crystals which were exposed to electrons, pion
s and muons. This test also featured a new digital readout system with
17 bits of dynamic range. The electron energy resolution is better th
an 1% at 5 GeV/c, and less than 0.5% at 60 GeV/c. The rejection factor
for 40 GeV/c pions is estimated to be several hundred with 95% electr
on efficiency.