New CDF end-plug calorimeter

The performance of the CDF end-plug calorimeter is described. The authors determined the energy resolutions to be σ/Ε = 14.5%/√Ε circleplus 0.7% for electron and σ/Ε = 68.0%/√Ε circleplus 4.1% for charged pion, where Ε is the energy measured in GeV. The response linearities satisfied their requirements. The response variations on the surface of a typical tower were measured to be 2.3% for e+ and 1.6% for π+. For the photon conversion detection by the preshower detector, they obtained the detection efficiency for two minimum ionizing particles to be 90--100% for the phototube gains of (1--4) x 105. The rate of π+'s depositing large fractions of energy in the electromagnetic section could be reduced by factors of 1.4--2.0 with keeping 95% efficiency for e+