Event

The 35 ton prototype for the Deep Underground Neutrino Experiment (DUNE) far detector was a single phase liquid argon time projection chamber (LAr-TPC) integrated detector that took cosmics data for a six week run from February to the middle of March 2016. The 35 ton was built to test the liquid argon technologies to be used by the full size DUNE far detector in a fully integrated system. The 35 ton had two drift volumes of lengths 2.23 m and 0.23 m on either side of its anode plane assembly (APA) and made use of wire planes with wrapped wires and a photon detection system (PDS) utilizing photon detection panels read out by silicon photomultipliers (SiPMs). We present an analysis of 35 ton detector cosmics data with a focus on the performance of the PDS.