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Liquid Argon Dielectric Breakdown Studies with the MicroBooNE Purification System

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arxiv 1408.0264 v1 pith:5W3RAWTP submitted 2014-08-01 physics.ins-det

R. Acciarri , B. Carls , C. James , B. Johnson , H. Jostlein , S. Lockwitz , B. Lundberg , J.L. Raaf
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R. Rameika B. Rebel G.P. Zeller M. Zuckerbrot
This is my paper · ORCID
classification physics.ins-det
keywords argonliquidbreakdownfieldmicroboonesystemcryogenicdependence
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The proliferation of liquid argon time projection chamber detectors makes the characterization of the dielectric properties of liquid argon a critical task. To improve understanding of these properties, a systematic study of the breakdown electric field in liquid argon was conducted using a dedicated cryostat connected to the MicroBooNE cryogenic system at Fermilab. An electrode sphere-plate geometry was implemented using spheres with diameters of 1.3 mm, 5.0 mm, and 76 mm. The MicroBooNE cryogenic system allowed measurements to be taken at a variety of electronegative contamination levels ranging from a few parts-per-million to tens of parts-per- trillion. The cathode-anode distance was varied from 0.1 mm to 2.5 cm. The results demonstrate a geometric dependence of the electric field strength at breakdown. This study is the first time that the dependence of the breakdown field on stressed cathode area has been shown for liquid argon.

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  1. A New Concept for Kilotonne Scale Liquid Argon Time Projection Chambers

    physics.ins-det 2019-08 conditional novelty 6.0 of 10

    A concept for a kilotonne-scale modular LArTPC using pixel readout, resistive field shells, and optical segmentation, proposed for a DUNE far detector module.

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