The Digitizer ReAdout Controller (DIRAC) of the Mu2e electromagnetic calorimeter at Fermilab
March 09, 2020
April 21, 2020
We report on the design and performance of the Digitizer ReAdout Controller (DIRAC) of the Mu2e electromagnetic calorimeter, which consists of a 670 CsI crystals matrix readout by SiPM. The 20-channels DIRAC performs 200 MHz sampling of the SiPM signals transmitted by the front-end electronics. Operation in the Mu2e hostile environment expected Total Ionizing Dose (TID) of 12 Krad and neutron fluence of 5x10 10 n/cm 2 @ 1 MeV eq (Si)/y, 1T magnetic field, level of vacuum of 10 -4 Torr has made the DIRAC design challenging. We describe design, specifications, architecture and results of the tests performed on the DIRAC prototypes.
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