Characterization and assembly of near-ultraviolet SiPMs for the Schwarzschild-Couder medium-size telescope proposed for the CTA Observatory

摘要

The rst prototype of the Schwarzschild Couder Medium Size Telescope (pSCT) proposed for the CTA obser-vatory has been installed in 2018 at the Fred Lawrence Whipple Observatory. The pSCT camera is composedof 25 modules with 64 channels each, covering only a small portion of the full focal plane of the telescope. TheItalian Institute of Nuclear Physics (INFN) has developed and characterized in collaboration with FondazioneBruno Kessler (FBK) a new generation of Silicon Photomultipliers (SiPMs) sensitive to the Near Ultravioletwavelengths, based on the High Density technology (NUV-HD devices). The latest generation of 6 6 mm2SiPMs (called NUV-HD3) have been used to equip a subsection of 9 out of 25 modules of the pSCT camera.An upgrade of this camera is foreseen between 2019 and 2020 using the same sensors, aiming to equip the fullfocal plane with 177 modules, for a total of more than 11000 pixels. We will present a full characterization ofthe performance of these devices, highlighting why they are suitable for Cherenkov light detection. An overviewon the overall behaviour of the installed sensors will be also given, providing information on the uniformity ofthe sensors and of the performance of the camera.