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T: Fachverband Teilchenphysik
T 53: Dark Matter II
T 53.5: Vortrag
Mittwoch, 1. April 2020, 17:30–17:45, H-HS XIV
Optimization of separation columns for Kr-in-Xe assays — Hardy Simgen, Veronica Pizzella, and •Daniel Winkler — Max-Planck-Institut für Kernphysik Heidelberg
Liquid-xenon time projection chambers are among the most sensitive detectors in search for Weakly Interacting Massive Particles as dark matter. Due to the expected very low event rate, ultra-low background conditions are required. One of the most serious intrinsic backgrounds is the radioactive isotope 85Kr, present in commercially available xenon. To achieve ultra-low concentrations, krypton traces are successfully reduced down to the ppq level e.g. by cryogenic distillation as for the XENONnT experiment.
The analytics of the remaining concentration can be performed off-line with a rare gas mass spectrometer (RGMS). Measuring ultra-low trace contaminations, a pre-separation of krypton in xenon by cryogenic gas-chromatography is necessary. The RGMS at the Max-Planck-Institut für Kernphysik in Heidelberg uses a homemade system with miniaturized packed adsorbent columns and UHV-tight all-metal valves well suited for high purity demands.
I present a dedicated set-up for column testing, separation and performance optimization as well as signal shape examination. First results of the set-up will be shown and an outlook for further optimization will be given.