The Calorimeter for the GLAST Large Area Telescope Available to Purchase

The Calorimeter (CAL) of the GLAST Large Area Telescope (LAT) is designed to measure the energy of cosmic gamma rays. The CAL is comprised of a segmented, hodoscopic array of CsI(Tl) scintillating crystals totaling 8.3 radiation lengths in depth. This design allows the CAL to image the development of gamma ray showers and reconstruct their incident energy with greater accuracy, and it makes the CAL a powerful tool in background rejection. The performance of the sixteen CAL Modules has remained stable from subsystem environmental testing through LAT integration and environmental testing. In combination with simulations, this test program has demonstrated that the CAL meets its design requirements.