Development, construction and qualification tests of the mechanical structures of the electromagnetic calorimeter of the Mu2e experiment at Fermilab

The "muon-to-electron conversion" (Mu2e) experiment at Fermilab will search for the charged lepton flavour violating neutrino-less coherent conversion of a muon into an electron in the field of an aluminum nucleus. The electromagnetic calorimeter is one of the three Mu2e detectors. The hostile Mu2e operational conditions, in terms of radiation levels (total ionizing dose of QR krad and a neutron fluence of 5x10-10 n/cm2 @ Q MeVeq (Si)/y), magnetic field intensity (1 T) and vacuum level (10−4 Torr) have posed tight constraints on the design of the detector mechanical structures and materials choice. In this report the mechanical overall description of the calorimeter is presented, such as the qualification tests performed during the construction of its components and the realized technological choices.