The Deap-Clean 3600 KG Liquid-Argon Detector

Details The Deap-Clean 3600 KG Liquid-Argon Detector The Deap-Clean 3600 KG Liquid-Argon Detector

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009fuin.conf..264j&link_type=abstract

FUNDAMENTAL INTERACTIONS . Proceedings of the 23rd Lake Louise Winter Institute 2008 . Held 18 - 23 February 2008 in Lake Louise

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Scientific paper

DEAP-CLEAN 3600 is a proposed single-phase liquid-argon for WIMP dark matter with a fiducial mass of 1000 kg of a total 3600 kg liquid argon. The principle effort of design is background reduction to an expected background rate < 1 tonne-1 year-1. This paper discusses the DEAP-CLEAN program and then focuses on two important backgrounds. First, energetic electrons from 39Ar in the detector volume are reduced with pulse-shape discrimination. Analysis of the time-distribution of light within events is predicted to remove all electrons from the data sample with leakage < 1 × 10- while rejecting fewer than 50% of nuclear-recoil events. Our current measured limit for electron leakage is < 6 × 10-8 and is statistics limited. Second, surface-alpha contamination from 222Rn daughters that plate out on the acrylic walls is reduced using a novel resurfacing system that operates in vacuum before fill with argon. This resurfacer removes approximately 10 microns of acrylic material and applies a wavelength-shifting compound.

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