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The Deep Underground Neutrino Experiment (DUNE) Far Detector (FD) will beformed by four 10-kton Liquid Argon (LAr) Time Projection Chambers (TPC) usingboth single and dual-phase technology. The dual-phase technology foreseen thecharge amplification in the gas phase before the signal collection and isfollowing a staged approach to demonstrate its feasibility at the DUNE FDscale. In 2017, a 4-ton demonstrator of 3x1x1 m$^3$ volume was exposed tocosmic muons and demonstrated expected performance in terms of chargeextraction and light collection. A bigger prototype (ProtoDUNE-DP), with anactive volume of 6x6x6 m$^3$, is currently under commissioning at CERN. Thephoton detection system in these detectors is crucial to provide the triggersignal giving an absolute time reference for the charge acquisition system ofrare non-beam events, and to provide complementary calorimetry. An overview ofthe analysis of the light collected in the 4-ton demonstrator has beenpresented. These prototypes confirmed the performance of the light detectionsystem to provide trigger based on the scintillation light signal, tocharacterize the LAr response to the crossing muons and to monitor the LArpurity. The analyzed data are compared with MC simulations to improve thevalues of less understood LAr optical parameters such as the Rayleighscattering length.

Scintillation light production, propagation, and detection in the 4-ton dual-phase LAr-TPC demonstrator (data analysis and simulations)