par Abusleme, Angel;Clerbaux, Barbara 
;Colomer Molla, Marta ;Petitjean, Pierre-Alexandre ;Yifan, Yang ; [et al.]
Référence European Physical Journal C. Particles and Fields, 82, 12, 1168
Publication Publié, 2022-12-01
;Colomer Molla, Marta ;Petitjean, Pierre-Alexandre ;Yifan, Yang ; [et al.]Référence European Physical Journal C. Particles and Fields, 82, 12, 1168
Publication Publié, 2022-12-01
Article révisé par les pairs
| Résumé : | Main goal of the JUNO experiment is to determine the neutrino mass ordering using a 20 kt liquid-scintillator detector. Its key feature is an excellent energy resolution of at least 3% at 1 MeV, for which its instruments need to meet a certain quality and thus have to be fully characterized. More than 20,000 20-inch PMTs have been received and assessed by JUNO after a detailed testing program which began in 2017 and elapsed for about four years. Based on this mass characterization and a set of specific requirements, a good quality of all accepted PMTs could be ascertained. This paper presents the performed testing procedure with the designed testing systems as well as the statistical characteristics of all 20-inch PMTs intended to be used in the JUNO experiment, covering more than fifteen performance parameters including the photocathode uniformity. This constitutes the largest sample of 20-inch PMTs ever produced and studied in detail to date, i.e. 15,000 of the newly developed 20-inch MCP-PMTs from Northern Night Vision Technology Co. (NNVT) and 5000 of dynode PMTs from Hamamatsu Photonics K. K.(HPK). |
