Production, calibration and environmental testing of the flight modules of GLAST CsI calorimeter

The full set of 16 flight GLAST CsI calorimeter modules, as well as two flight-spare modules, were assembled in 2004-2005. Each module contains 96 CsI crystals supported by a carbon fiber composite structure and read out from both ends with silicon PIN photodiodes to provide the position measurement along the crystal. Signals from the array of photodiodes are processed by custom analog ASICs and commercial ADCs. After assembly, each module underwent a full environmental test program - including EM interference and compatibility, vibration, and thermal-vacuum test - to flight-acceptance levels. The functional performance of each module was verified before and after each test, and calibration with cosmic muons and charge injection was performed throughout the test sequence. All 18 modules showed stable functioning over the few months of the assembly and test program. None of the 1728 crystals experienced mechanical or optical degradation. Integration of the calorimeter modules with the other detector and electronics subsystems into the complete Large Area Telescope began at SLAC in April 2005 and is scheduled for completion early in 2006. In this paper we present the results of calorimeter modules calibration and testing