Performance of the DUNE Photon Detection System

DUNE (Deep Underground Neutrino Experiment) is a long-baseline experiment currently under construction at the Sanford Underground Research Facility (SURF) in South Dakota, US. The Far Detector (FD) is based on the Liquid Argon Time Projection Chamber (LAr-TPC) technology. The main physics goals of DUNE include determining the mass ordering of neutrinos with a significance greater than > 5 σ and measuring the CP-violating phase in the lepton sector by studying neutrino oscillations. DUNE is also expected to be highly competitive in studying astro-particle phenomena, such as solar, atmospheric, and supernova neutrinos. The Photon Detection System (PDS) serves as the trigger for non-beam events in the experiment and provides the estimation of the absolute time of an event. This capability enables the reconstruction of the interaction vertex with a precision on the order of 1 mm. Additionally, the PDS enhances the energy resolution of the experiment with the combined charge-light calorimetry.