Performance of the Pilot Dual-Phase Detector for Deep Underground Neutrino Experiment*

The purpose of this paper is to understand the energy deposition of the 3x1x1 meter prototype dual-phase detector for the Deep Underground Neutrino Experiment (DUNE). I will discuss the geometry of the time projection chamber (TPC) in this paper to fully understand how the TPC performs. The process of experimenting begins when a cosmic ray particle passes through the detector ionizing the electrons in the liquid argon (LAr) as it traverses the TPC. These ionized electrons travel upwards to the LAr surface under an uniform electric field and is extracted to the gas phase. Afterwards, the charge is amplified by the large electron multipliers (LEMs) and charge is thus collected by the 2D readout plane. With this data, I will present the performance (effective gain) of the detector, and the efficiency of the extraction grid. I will further present how mechanical issues can disrupt performance of the extraction grid, LEMs, and anode readout plane.