Bulletin of the American Physical Society
APS April Meeting 2024
Wednesday–Saturday, April 3–6, 2024; Sacramento & Virtual
Session T11: Muon Physics
3:45 PM–5:33 PM,
Saturday, April 6, 2024
SAFE Credit Union Convention Center
Room: Ballroom B9, Floor 2
Sponsoring
Unit:
DPF
Chair: Robert Bernstein, Fermilab
Abstract: T11.00009 : Design, construction and qualification tests of the Mu2e crystal calorimeter
5:21 PM–5:33 PM
Presenter:
Pierluigi Fedeli
(INFN - Laboratori Nazionali Frascati)
Author:
Pierluigi Fedeli
(INFN - Laboratori Nazionali Frascati)
The conversion electron has a clear monoenergetic signature at 104.967 MeV, slightly below the muon rest mass, and will be identified by a complementary measurement carried out by a high-resolution tracker and an electromagnetic calorimeter (EMC). The calorimeter is composed of 1348 pure CsI crystals, each read by two custom UV-extended SiPMs, that are arranged in two annular disks. The EMC should achieve better than 10% energy resolution and 500 ps timing resolution for 100 MeV electrons and maintain extremely high levels of reliability and stability and in a harsh operating environment with high vacuum, 1 T B-field and radiation exposures up to 100 krad and 1012 n1MeVeq/cm2.
The calorimeter technological choice, along with the design of the custom front-end electronics, cooling and mechanical systems were validated through an electron beam test on a large-scale 51-crystals prototype (Module-0) and extensive test campaigns that characterized and verified the performance of crystals, photodetectors, analogue and digital electronics. This included hardware stress tests and irradiation campaigns with neutrons, protons, and photons.
The production and QC phases of all calorimeter components is completed apart for the digital electronics that is being produced. A series of vertical slice tests with the final electronics was carried out on the Module-0 at LNF to implement and validate calibration procedures. The two calorimeter disks have been assembled at the moment of writing. Status of construction will be summarised, along with plans for commissioning and first calibration of the fully assembled disks.
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