The Readout Electronics of the Mu2e Electromagnetic Calorimeter

Conference · Mon Mar 07 00:00:00 EST 2022 · PoS - Proceedings of Science

DOI:https://doi.org/10.22323/1.380.0113· OSTI ID:1873713

Morescalchi, Luca  ^[1]; Cervelli, Franco  ^[1]; DiFalco, Stefano  ^[1]; Donati, Simone  ^[1]; Gioiosa, Antonio  ^[1]; Pasciuto, Daniele  ^[1]; Pedreschi, Elena  ^[1]; Raffaelli, Fabrizio  ^[1]; Spinella, Franco  ^[1]; Taffara, Alessandra ^[1]; Ceravolo, Sergio ^[2]; Colao, Francesco ^[2]; Corradi, Gianni ^[2]; Diociaiuti, Eleonora  ^[2]; Giovannella, Simona  ^[2]; Happacher, Fabio  ^[2]; Martini, Matteo  ^[2]; Miscetti, Stefano  ^[2]; Paesani, Daniele ^[2]; Sarra, Ivano  ^[2]

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1. INFN, Pisa
2. Frascati

The Mu2e electromagnetic calorimeter has been designed to measure ~100 MeV electrons with energy resolution σE/E <10%, time resolution σt < 500ps and position resolution σx < 1cm. The detector is composed of 1348 un-doped CsI crystals coupled to two large area Silicon Photomultipliers (SiPMs). Each SiPM is connected to a Front End Electronics (FEE) chip which hosts the shaping amplifier and the high voltage linear regulator. A group of 20 FEE is controlled by one Mezzanine Board (MB) which transmits the amplified signals to one Digitizer ReAdout Controller board (DiRAC). The DiRAC samples the waveforms at 200 MHz with 12-bit ADCs, packs the data according to the Mu2e custom format and transmits them to the event builder through an optical transceiver. To limit the number of pass-through connectors and the length of the cables, the readout and digitization electronics is located inside the detector cryostat and close to the interaction target. The boards will have to sustain a neutron fluence of about 5x10¹⁰ n/cm² @ 1 MeVeq (Si)/y and a Total Ionizing Dose of about 12 krad, while working into a 1T magnetic field and a vacuum of 10^(-4) Torr. This harsh operational environment has made the electronics design challenging and required an extended campaign of tests to select and qualify the employed electronic components. In this paper we report on the board architecture and design, on the qualification of the prototypes, as well as on the results of the first vertical slice test of the Mu2e calorimeter.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Contributing Organization: Mu2e
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1873713
• Report Number(s): FERMILAB-CONF-22-329-V; oai:inspirehep.net:2067264
• Journal Information: PoS - Proceedings of Science, Vol. 380; Conference: Particles and Nuclei International Conference 2021 (PANIC2021); ISSN 1824-8039
• Publisher: SISSA
• Country of Publication: United States
• Language: English

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