Spatial and temporal evaluations of the liquid argon purity in ProtoDUNE-SP
Creators
- 1. Inst Res Fundamental Sci, Tehran, Iran
- 2. CERN, European Org Nucl Res, CH-1211 Meyrin, Switzerland
- 3. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA
- 4. Univ Tecnol Fed Parana, Curitiba, Parana, Brazil
- 5. Univ Atlantico, Barranquilla, Atlantico, Colombia
- 6. Georgian Tech Univ, Tbilisi, Georgia
- 7. Univ Estadual Campinas, BR-13083970 Campinas, SP, Brazil
- 8. Univ Rochester, Rochester, NY 14627 USA
- 9. Ist Nazl Fis Nucl, Sez Lecce, I-73100 Lecce, Italy
- 10. Univ Colorado Boulder, Boulder, CO 80309 USA
- 11. Kansas State Univ, Manhattan, KS 66506 USA
- 12. Augustana Univ, Sioux Falls, SD 57197 USA
- 13. Ctr Invest Energet Medioambientales & Tecnol, E-28040 Madrid, Spain
- 14. Imperial Coll Sci Technol & Med, London SW7 2BZ, England
- 15. Florida State Univ, Tallahassee, FL 32306 USA
Description
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.
Files
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