Design and qualification of the Mu2e electromagnetic calorimeter electronic system


Design and qualification of the Mu2e electromagnetic calorimeter electronic system

Ceravolo, S.; Colao, F.; Diociaiuti, E.; Corradi, G.; Di Falco, S.; Donati, S.; Fiore, S.; Ferrari, A.; Gioiosa, A.; Giovannella, S.; Happacher, F.; Martini, M.; Miscetti, S.; Morescalchi, L.; Müller, S.; Paesani, D.; Pasciuto, D.; Pedreschi, E.; Raffaelli, F.; Saputi, A.; Sarra, I.; Sanzani, E.; Spinella, F.; Taffara, A.

The Mu2e experiment [1] at Fermilab will search for the neutrino-less coherent
conversion of a muon into an electron in the field of a nucleus. Mu2e detectors
comprise a strawtracker, an electromagnetic calorimeter and a veto for cosmic
rays. The calorimeter employs 1348 Cesium Iodide crystals readout by silicon
photomultipliers and fast front-end and digitization electronics. The front-end
electronics consists of two discrete chips for each crystal. These provide the
amplification and shaping stage,linear regulation of the SiPM bias voltage and
monitoring. The SiPM and front-end control electronics is implemented in a bat-
tery of mezzanine boards each equipped with an ARM processor that controls
a group of 20 Amp-HV chips, distributes the low voltage and the high-voltage
reference values, sets and reads back the locally regulated voltages. The elec-
tronic is hosted in crates located on the external surface of calorimeter disks.
The crates also host the waveform digitizer board (DIRAC) that performs dig-
itization of the front end signals and transmit the digitized data to the Mu2e
DAQ. Calorimeter electronic is hosted inside the cryostat and it must substain
very high radiation and magnetic field so it was necessary to fully qualify it.
The constraints on the calorimeter front-end and readout electronics, the design
technological choices and the qualification tests will be reviewed.

Keywords: Front-end electronics; Radiation hardness; Calorimetry

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Publ.-Id: 34933