The status and results from ProtoDUNE Single Phase

Abstract DUNE is a leading-edge, international experiment for neutrino science and proton decay. Its ambitious physics program requires a careful prototyping of the engineering solutions envisaged for the scale-up of the LArTPC technology, as well as a careful control of the systematics through the acquisition of a deep knowledge of the detector response and performances. ProtoDUNE is an an extensive prototype program developed at the European Research Center (CERN) Neutrino Platform facility with the aim to answer to all the open questions about DUNE design. The Single Phase prototype (ProtoDUNE SP) has been assembled between 2017 and 2018 and it successfully took its first beam data from a dedicated SPS tertiary line from September to November 2018.</jats:p

TPB thickness and Quantum Efficiency measurements for the new ICARUS T600 light detection system in the SBN program.

Tetra-Phenyl-Butadiene (TPB) has been widely used in the last years in LAr experiments due to its property to convert VUV into visible light. To this purpose, a study of its property has been performed in order to obtain the best TPB coating on the PMT sensitive window for the new ICARUS T600 light detection system in the Short-Baseline Neutrino program at FNAL

Timing properties of Hamamatsu R5912-MOD photomultiplier tube for the ICARUS T600 light detection system

The ICARUS T600 liquid argon time projection chamber (LAr-TPC) will operate at shallow depth as far detector for the Short Baseline Neutrino (SBN) program at FNAL. A new scintillation light detection system, with a time resolution of the order of the nanosecond, is required to distinguish the actual beam related events from the huge cosmic background. The chosen photomultiplier tube (PMT) model is the Hamamatsu R5912-MOD. This has an 8 in. diameter window made of borosilicate glass, 10 dynodes and a bialkali photo-cathode with platinum undercoating, suitable for cryogenic applications. The main timing characteristics of this PMT model – namely the absolute transit time vs. power supply, the transit time spread for light hitting different window places and for different PMT orientations with respect to the Earth’s magnetic field – have been evaluated in order to confirm the suitability of this PMT model to the requirements of the SBN program

Linearity and saturation properties of Hamamatsu R5912-MOD photomultiplier tube for the ICARUS T600 light detection system

The ICARUS T600 liquid argon time projection chamber (LAr-TPC) will operate at shallow depth as far detector for the Short Baseline Neutrino (SBN) program at FNAL. A new scintillation light detection system, based on 360 Hamamatsu R5912-MOD Photomultiplier Tubes (PMTs), will allow to distinguish the actual beam related events from the huge cosmic background. A fundamental parameter for the correct reconstruction of events is the linearity of the photon detection system. The main response characteristics of the adopted PMT model as a function of the incident light intensity was evaluated. A comparison of the behavior at room and at cryogenic temperature was also carried out. Results confirm the conformity of this PMT model to the requirements of the ICARUS T600 light detection system

Performance of large area PMTs at cryogenic temperatures for neutrino and rare event physics experiments

An evaluation of the behavior of three large cathode area photo-multiplier tubes, Hamamatsu R5912 Mod and R5912-02 Mod, and ETL 9357 KFLB, was carried out both at room temperature and immersed in liquid nitrogen, at a temperature of 77K. The main electrical and optical features of the devices were studied: signal shape, photo-cathode response uniformity, gain, linearity and dark count rate. An evaluation of the quantum efficiency was also made in the vacuum ultraviolet light region