Characterization and performance of PADME's Cherenkov-based small-angle calorimeter

A. Frankenthal, J. Alexander, B. Buonomo, E. Capitolo, C. Capoccia, C. Cesarotti, R. De Sangro, C. Di Giulio, F. Ferrarotto, L. Foggetta, G. Georgiev, P. Gianotti, M. Hunyadi, V. Kozhuharov, A. Krasznahorkay, E. Leonardi, G. Organtini, G. Piperno, M. Raggi, C. RellaA. Saputi, I. Sarra, E. Spiriti, C. Taruggi, P. Valente

Research output: Article

3 Citations (Scopus)

Abstract

The PADME experiment, at the Laboratori Nazionali di Frascati (LNF), in Italy, will search for invisible decays of the hypothetical dark photon via the process e+e→γA, where the A escapes detection. The dark photon mass range sensitivity in a first phase will be 1 to 24 MeV. We report here on performance measurements and simulation studies of a prototype of the Small-Angle Calorimeter, a component of PADME's detector dedicated to rejecting 2- and 3-gamma backgrounds. The crucial requirement is a timing resolution of less than 200 ps, which is satisfied by the choice of PbF2 crystals and the newly released Hamamatsu R13478UV photomultiplier tubes (PMTs). We find a timing resolution of 81 ps (with double-peak separation resolution of 1.8 ns) and a single-crystal energy resolution of 10% at 550 MeV with light yield of 2.05 photo-electrons per MeV, using 100 to 400 MeV electrons at the Beam Test Facility of LNF. We also propose the investigation of a two-PMT solution coupled to a single PbF2 crystal for higher-energy applications, which has potentially attractive features.

Original languageEnglish
Pages (from-to)89-97
Number of pages9
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume919
DOIs
Publication statusPublished - márc. 1 2019

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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    Frankenthal, A., Alexander, J., Buonomo, B., Capitolo, E., Capoccia, C., Cesarotti, C., De Sangro, R., Di Giulio, C., Ferrarotto, F., Foggetta, L., Georgiev, G., Gianotti, P., Hunyadi, M., Kozhuharov, V., Krasznahorkay, A., Leonardi, E., Organtini, G., Piperno, G., Raggi, M., ... Valente, P. (2019). Characterization and performance of PADME's Cherenkov-based small-angle calorimeter. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 919, 89-97. https://doi.org/10.1016/j.nima.2018.12.035