The CLEO II detector

Modification of the CLEO II detector designed for identification of vector mesons and b-quarks in experiments on the Cornell University electron storage ring is described. A high-resolution electromagnetic calorimeter based on CsI scintillation crystals with the data read-out using silicon photodiodes is the main improvement incorporated in CLEO II. A new larger-diameter superconducting solenoid aimed at increasing spatial resolusion is constructed. A new steel yoke, hadron abserber and muon counters based on plastic tubes operating in the proportional regime are also fabricated. The experiments are to begin in January 1989. 4 refs.; 3 figs