New CDF end-plug calorimeter

The performance of the CDF end-plug calorimeter is described. We determined the energy resolutions to be σ/E=14.5%/E⊕0.7% for electron and σ/E=68.0%/E⊕4.1% for charged pion, where E is the energy measured in GeV. The response linearities satisfied our 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, we obtained the detection efficiency for two minimum ionizing particles to be 90–100% for the phototube gains of (1–4)×105. The rate of π+ʹs depositing large fractions of energy in the electromagnetic section could be reduced by factors of 1.4–2.0 with keeping 95% efficiency of e+.