The Liquid Argon Purity Demonstrator

Abstract

The Liquid Argon Purity Demonstrator was an R&D test stand designed to determine if electron drift lifetimes adequate for large neutrino detectors could be achieved without first evacuating the cryostat. We describe here the cryogenic system, its operations, and the apparatus used to determine the contaminant levels in the argon and to measure the electron drift lifetime. The liquid purity obtained by this system was facilitated by a gaseous argon purge. Additionally, gaseous impurities from the ullage were prevented from entering the liquid at the gas-liquid interface by condensing the gas and filtering the resulting liquid before returning to the cryostat. The measured electron drift lifetime in this test was greater than 6 ms, sustained over several periods of many weeks. Measurements of the temperature profile in the argon, to assess convective flow and boiling, were also made and are compared to simulation.

28 pages, 22 figures, 3 tables

References in corpus (4)

• The ArgoNeuT Detector in the NuMI Low-Energy beam line at Fermilab
• Underground operation of the ICARUS T600 LAr-TPC: first results
• The 2010 Interim Report of the Long-Baseline Neutrino Experiment Collaboration Physics Working Groups
• Design and operation of ARGONTUBE: a 5 m long drift liquid argon TPC

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• Review of Liquid Argon Detector Technologies in the Neutrino Sector
• Liquid Argon Dielectric Breakdown Studies with the MicroBooNE Purification System
• Summary of the Second Workshop on Liquid Argon Time Projection Chamber Research and Development in the United States
• The science and technology of liquid argon detectors
• Measurement of ambient radon progeny decay rates and energy spectra in liquid argon using the MicroBooNE detector
• Design and operation of LongBo: a 2 m long drift liquid argon TPC
• Cryogenic CMOS Cameras for High Voltage Monitoring in Liquid Argon
• Design and performance of a 35-ton liquid argon time projection chamber as a prototype for future very large detectors
• Photon detector system timing performance in the DUNE 35-ton prototype liquid argon time projection chamber
• Spatial and Temporal Evaluations of the Liquid Argon Purity in ProtoDUNE-SP
• Electron drift in a large scale solid xenon
• A 20-Liter Test Stand with Gas Purification for Liquid Argon Research
• The CAPTAIN Experiment
• Calibration of calorimetric measurement in a liquid argon time projection chamber