Ponente
Descripción
The Deep Underground Neutrino Experiment (DUNE) is an international experiment that uses Liquid Argon Time Projection Chambers (LArTPCs) for advanced neutrino science. Detectors to be used in this configuration to collect the scintillation light must be compliant with the cryogenic environment and exhibit low levels of dark noise. FBK has developed NUV-HD-Cryo SiPM technology for cryogenic applications such as the DarkSide experiment. This technology features a very low dark noise in the order of few mHz/mm2 at cryogenic temperature, thanks to a low peak value of the electric field, a low afterpulsing probability and a limited variation of the quenching resistance with temperature. Further development was carried out in the framework of the DUNE collaboration. The NUV-HD-Cryo technology was customized in order to reduce the optical CrossTalk (CT) by increasing the number of Deep Trench Isolation (DTI). In this work, the characterization of these devices is reported making a comparison between three different devices having similar gain but different number of DTIs. The optical crosstalk is reduced approximately by a factor of 3 for the device with three trenches with respect to the single trench sample, with a CT of ~10% at a PDE of 43% measured at 435nm. Thanks to this customization, these devices fulfilled the requirements to be used in the Horizontal Drift Detector of the DUNE experiment. For the mass production it is foreseen a fabrication of 140000 SiPMs to be supplied within two years. Diverse SiPM runs were produced for preliminary investigation measurements and evaluation of the mass production capability. A comparison between these runs in terms of breakdown voltage, dark current and forward resistance uniformity is reported and compared with the DUNE requirements.
