Progress status for the Mu2e calorimeter

The Mu2e experiment at Fermilab searches for the charged-lepton flavor violating conversion of a negative µ into an e- in the field of an Al nucleus. The Mu2e goal is to improve by four orders of magnitude the current best limit on the search sensitivity. The main detector consists of a straw-tube tracker and a crystal calorimeter housed in a 1 T superconduction solenoid. The calorimeter plays a major role in providing particle identification capabilities, a fast online trigger filter, a seed for track reconstruction. The calorimeter design consists of two disks, each one made of 674 pure CsI crystals read by two arrays of UV-extended silicon photomultipliers (SiPMs). The first large-scale calorimeter prototype, the Module-0, was characterized with an electron beam in the energy range around 100 MeV at the Beam Test Facility in Frascati (Italy). Results of the test will be shown. We also report the results of the QA tests that have been made over the SiPMs and the crystals used for the final assembly.