The construction and performance of the CsI hodoscopic calorimeter for the GLAST beam test engineering module

We describe the design, construction, and performance of the CsI hodoscopic calorimeter of the GLAST beam test engineering module (BTEM), a full-size prototype of one of the 16 towers of the GLAST large-area telescope, approved by NASA to be launched in 2005. The calorimeter is composed of 80 CsI crystals organized in a hodoscopic arrangement with eight layers of ten crystals. The crystals are rea...