Comunicazione

# The DUNE photon detection system.

##### Massari C. per il DUNE PDS Consortium
Giovedì 15/09   09:00 - 13:00   Aula T - Caterina Scarpellini   III - Astrofisica
DUNE is the US flagship project in neutrino physics and is currently under construction at Fermilab and South Dakota. The DUNE far detector is based on the liquid-argon TPC technology proposed by C. Rubbia in 1977. Liquid argon is also a high-yield scintillator, which produces about 25000 $128 {nm}$ photons per MeV. In this contribution, I will present the DUNE photon detection system (PDS) to shift, trap, and record the scintillator light, and provide the interaction time of neutrinos in DUNE together with a calorimetric energy measurement (light-charge anticorrelation). I discuss the performance of the system measured in the DUNE laboratories of Milano-Bicocca using both cosmic rays and alpha sources with custom cryogenic SiPMs. Special emphasis will be given to cryo-reliability of the semiconductor detectors and the light trapping system (coated dichroic filters coupled with WLS bars) in liquid nitrogen and liquid argon. The tests demonstrated the long-term reliability of the setup and initiated the assembly of the PDS in the ProtoDUNE-SP detector at CERN. The status of the construction and perspectives for the Run II of ProtoDUNE-SP in 2022 will also be reviewed.