Test results of a 31 cm×31 cm lead glass electromagnetic shower detector

Abstract The performance of an electromagnetic shower detector comprised only of active elements was evaluated using a tagged electron beam at various momenta from 30–100 GeV/ c . Cerenkov light from three sections of lead glass blocks provides measurements of total shower energy with a resolution of σ = (0.114±0.008) E GeV /c 2 . A plastic scintillator hodoscope situated behind the first two lead glass layers samples the transverse development of the shower, allowing position determination of the incident electron with σ = 1.4 mm resolution.