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Published March 11, 2016 | Submitted
Journal Article Open

Measurement of time resolution of the Mu2e LYSO calorimeter prototype


In this paper we present the time resolution measurements of the Lutetium–Yttrium Oxyorthosilicate (LYSO) calorimeter prototype for the Mu2e experiment. The measurements have been performed using the e− beam of the Beam Test Facility (BTF) in Frascati, Italy in the energy range from 100 to 400 MeV. The calorimeter prototype consisted of twenty five 30 x 30 x 130 mm^3, LYSO crystals read out by 10 × 10 mm^2 Hamamatsu Avalanche Photodiodes (APDs). The energy dependence of the measured time resolution can be parametrized as σ_t(E)=a/√E/GeV⊕b, with the stochastic and constant terms a=(51 ± 1)ps and b=(10 ± 4)ps, respectively. This corresponds to the time resolution of (162 ±4 )ps at 100 MeV.

Additional Information

© 2016 Elsevier B.V. The authors are grateful to many people for the successful realization of the calorimeter prototype. In particular, we thank all the LNF mechanical shop for the realization of the support and the APD boxes. We also thank the whole BTF staff for providing the beam time and helping us in getting a smooth running period. We express our warmest thanks to Luca Foggetta, for adjusting and tuning the beam to our detector needs.

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