A novel technique for the study of pile-up events in cryogenic bolometers

• Published in: Physical review. C 2020-11, Vol.104
• Main Authors: Armatol, A, Armengaud, E, Armstrong, W, Augier, C, Avignone, F T, Azzolini, O, Barabash, A, Bari, G, Barresi, A, Baudin, D, Bellini, F, Benato, G, Beretta, M, Bergé, L, Biassoni, M, Billard, J, Boldrini, V, Branca, A, Brofferio, C, Bucci, C, Camilleri, J, Capelli, S, Cappelli, L, Cardani, L, Carniti, P, Casali, N, Cazes, A, Celi, E, Chang, C, Chapellier, M, Charrier, A, Chiesa, D, Clemenza, M, Colantoni, I, Collamati, F, Copello, S, Cova, F, Cremonesi, O, Creswick, R J, Cruciani, A, d'Addabbo, A, d'Imperio, G, Dafinei, I, Danevich, F A, de Combarieu, M, de Jesus, M, de Marcillac, P, Dell'Oro, S, Domizio, S Di, Dompè, V, Drobizhev, A, Dumoulin, L, Fantini, G, Fasoli, M, Faverzani, M, Ferri, E, Ferri, F, Ferroni, F, Figueroa-Feliciano, E, Formaggio, J, Franceschi, A, Fu, C, Fu, S, Fujikawa, B K, Gascon, J, Giachero, A, Gironi, L, Giuliani, A, Gorla, P, Gotti, C, Gras, P, Gros, M, Gutierrez, T D, Han, K, Hnasen, E V, Heeger, K M, Helis, D L, Huang, H Z, Huang, R G, Imbert, L, Johnston, J, Juillard, A, Karapetrov, G, Keppel, G, Khalife, H, Kobychev, V V, Kolomensky, Yu G, Konovalov, S, Liu, Y, Loaiza, P, Ma, L, Madhukuttan, M, Mancarella, F, Mariam, R, Marini, L, Marnieros, S, Martinez, M, Maruyama, R H, Mauri, B, Mayer, D
• Format: Article
• Language: English
• Subjects: benchmark; bolometer; cryogenics; data analysis method; double-beta decay: (0neutrino); efficiency; Gran Sasso; Instrumentation and Detectors; numerical calculation; Physics; pile-up; time resolution
• ISSN: 2469-9985; 2469-9993
• DOI: 10.1103/PhysRevC.104.015501

Precise characterization of detector time resolution is of crucial importance for next-generation cryogenic-bolometer experiments searching for neutrinoless double-beta decay, such as CUPID, in order to reject background due to pile-up of two-neutrino double-beta decay events. In this paper, we describe a technique developed to study the pile-up rejection capability of cryogenic bolometers. Our approach, which consists of producing controlled pile-up events with a programmable waveform generator, has the benefit that we can reliably and reproducibly control the time separation and relative energy of the individual components of the generated pile-up events. The resulting data allow us to optimize and benchmark analysis strategies to discriminate between individual and pile-up pulses. We describe a test of this technique performed with a small array of detectors at the Laboratori Nazionali del Gran Sasso, in Italy; we obtain a 90% rejection efficiency against pulser-generated pile-up events with rise time of ~15 ms down to time separation between the individual events of 2 ms.