Spatial and temporal evaluations of the liquid argon purity in ProtoDUNE-SP | CU Experts

Abstract; Liquid argon time projection chambers (LArTPCs) rely on; highly pure argon to ensure that ionization electrons produced by; charged particles reach readout arrays. ProtoDUNE Single-Phase; (ProtoDUNE-SP) was an approximately 700-ton liquid argon detector; intended to prototype the Deep Underground Neutrino Experiment; (DUNE) Far Detector Horizontal Drift module. It contains two drift; volumes bisected by the cathode plane assembly, which is biased to; create an almost uniform electric field in both volumes. The DUNE; Far Detector modules must have robust cryogenic systems capable of; filtering argon and supplying the TPC with clean liquid. This paper; will explore comparisons of the argon purity measured by the purity; monitors with those measured using muons in the TPC from October; 2018 to November 2018. A new method is introduced to measure the; liquid argon purity in the TPC using muons crossing both drift; volumes of ProtoDUNE-SP. For extended periods on the timescale of; weeks, the drift electron lifetime was measured to be above 30 ms; using both systems. A particular focus will be placed on the; measured purity of argon as a function of position in the detector.

Abbaslu S; Abed Abud A; Acciarri R; Accorsi LP; Acero MA; Adames MR; Adamov G; Adamowski M; Adriano C; Akbar F

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