Proto-DUNE NP04 Horizontal Drift Shift control and Purity Monitor using Bi-207

The Deep Underground Neutrino Experiment (DUNE) is a flagship neutrino physics experiment aimed at probing the fundamental properties of neutrinos, some of the universe's most elusive particles. As part of the DUNE validation process, ProtoDUNE, a prototype detector hosted at CERN is employed to test and optimize the Liquid Argon Time Projection Chamber (LArTPC) technology, which is essential for the full-scale DUNE detector. This report focuses on the beam run of the NP04 horizontal drift detector in ProtoDUNE, a 1:25 scale prototype with full-scale components of the DUNE Far Detector 1, a single-phase LArTPC with horizontal drift. This study examines my responsibilities in the control room and the analysis of Bismuth-207 (Bi-207) as a potential tool for monitoring the purity of liquid argon (LAr) at DUNE. We present a comprehensive analysis of the detector's shift control, LAr purity assessment, and future work to fully utilize Bi-207 for purity monitoring.