Construction and Commissioning of the DUNE ND-LAr 2x2 Modules

The Deep Underground Neutrino Experiment (DUNE) is a long-baseline neutrino oscillation experiment with a 70kt liquid argon time projection chamber (LAr TPC) at the Far Detector complex at the Sanford Underground Research Facility (SURF) and a Near Detector (ND) complex planned for the Fermi National Accelerator Laboratory. The ND complex plans for three detector subsystems, including a 150t modular LAr TPC comprised of 35 optically segregated modules. A prototype detector of four modular detectors, DUNE ND-LAr 2x2, will operate in 2023 in Fermilab's NuMI beam. After the construction of the modules was completed, they were successfully operated and commissioned in liquid argon using cosmic-ray muons at the University of Bern. The talk will discuss the overall design of the ND-LAr modules, the construction of these modules, and the performance results obtained from the cosmic-ray data-taking samples.