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

Characterization and performance of PADME’s Cherenkov-based small-angle calorimeter / 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.; Rella, C.; Saputi, A.; Sarra, I.; Spiriti, E.; Taruggi, C.; Valente, P.. - In: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT. - ISSN 0168-9002. - 919(2019), pp. 89-97. [10.1016/j.nima.2018.12.035]

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

KOZHUHAROV, VENELIN VALERIEV;Organtini, G.;Piperno, G.;Raggi, M.;
2019

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
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11573/1215827
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