Dr Raffaella Donghia (National Laboratories of Frascati of INFN)
The Mu2e experiment at Fermilab will search for the charged-lepton flavour violating neutrino-less conversion of a negative muon into an electron in the field of an aluminum nucleus. The Mu2e detector is composed of a tracker and an electromagnetic calorimeter and an external veto for cosmic rays. The calorimeter plays an important role in providing excellent particle identification capabilities, a fast online trigger filter while aiding the track reconstruction capabilities. The calorimeter requirements are to provide a large acceptance for ~100 MeV electrons and reach: 1) a time resolution better than 0.5 ns; 2) an energy resolution O(10%); 3) a position resolution of 1 cm. The calorimeter consists of two disks, each one made of 674 pure CsI crystals readout by two large area 2x3 array of UV-extended SiPMs of 6x6 mm^2 dimensions. A large scale prototype has also been constructed and tested at the beam test facility in Frascati. It consists of 51 pre-production crystals readout by a 102 SiPM. All the test and progresses done to define the calorimeter design, the satisfying results obtained with the test beam of the prototype as well as the current production phase will be presented. At the moment, all the components for the first disk has been characterized. The construction starting is planned for spring 2020.
Prof. Matteo MARTINI (INFN Frascati)
Dr fabio happacher (INFN)