Status of the development of NUV SiPMs for INFN optical modules for the SCT medium sized telescope proposed for the CTA observatory

Adams, C.; Ambrosi, G.; Ambrosio, M.; Aramo, C.; Benbow, W.; Bertucci, B.; Bissaldi, E.; Bitossi, M.; Boiano, A.; Bonavolonta, C.; Bose, R.; Brill, A.; Buckley, J. H.; Caprai, M.; Covault, C. E.; Di Venere, L.; Feng, Q.; Fiandrini, E.; Gent, A.; Giglietto, N.; Giordano, F.; Halliday, R.; Hervet, O.; Hughes, G.; Humensky, T. B.; Ionica, M.; Jin, W.; Kaaret, P.; Kieda, D.; Kim, B.; Licciulli, F.; Loporchio, S.; Masone, V.; Meures, T.; Mode, B. A. W.; Mukherjeek, R.; Okumura, A.; Otte, N.; Pantaleo, F. R.; Paoletti, R.; Petrashyk, A.; Powell, J.; Powell, K.; Riberio, D.; Rouselle, J.; Rugliancich, A.; Santander, M.; Shang, R.; Stevenson, B.; Stiaccini, L.; Taylor, L. P.; Tosti, L.; Vagelli, V.; Valentino, M.; Vandenbroucke, J.; Vassiliev, V.; Wilcox, P.; Williams, D. A.

doi:10.1016/j.nima.2020.164486

Near UltraViolet High Density (NUV-HD) SiPMs produced by Fondazione Bruno Kessler in collaboration with INFN have been tested and characterized in INFN laboratories. The third generation of these devices (HD3) has proven to be suitable to equip the focal plane of the prototype Schwarzschild–Couder Medium Size Telescope (pSCT) proposed for the Cherenkov Telescope Array Observatory. Photosensors have been assembled in 4 16-pixel optical units coupled with TARGET–7 ASIC front-end electronics for amplification and digitization of the signal. At present, 9 modules have been successfully integrated on the pSCT camera and are currently taking data. In this contribution we report on the performances of the HD3 technology as single sensor and as assembled optical units, showing their performance and homogeneity in terms of gain and dark count rate.