In situ measurements of Krypton in Xenon gas with a quadrupole mass spectrometer following a cold-trap at a temporarily reduced pumping speed

Abstract

A new method for measuring trace amounts of krypton in xenon using a cold trap with a residual gas analyzer has been developed, which achieves an increased sensitivity by temporarily reducing the pumping speed while expending a minimal amount of xenon. By partially closing a custom built butterfly valve between the measurement chamber and the turbomolecular pump, a sensitivity of 40 ppt has been reached. This method has been tested on an ultra-pure gas sample from Air Liquide with an unknown intrinsic krypton concentration, yielding a krypton concentration of $330\pm 200$ ppt.

15 pages, 8 figures

References in corpus (10)

• Dark Matter Results from 225 Live Days of XENON100 Data
• The XENON100 Dark Matter Experiment
• Liquid Xenon Detectors for Particle Physics and Astrophysics
• Observation of Two-Neutrino Double-Beta Decay in Xe-136 with EXO-200
• The EXO-200 detector, part I: Detector design and construction
• Limits on Majoron-emitting double-beta decays of Xe-136 in the KamLAND-Zen experiment
• Detection of krypton in xenon for dark matter applications
• A simple high-sensitivity technique for purity analysis of xenon gas
• Xenon purity analysis for EXO-200 via mass spectrometry
• A xenon gas purity monitor for EXO

Cited by in corpus (2)

• DARWIN: towards the ultimate dark matter detector
• The XENON1T Dark Matter Experiment