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T: Fachverband Teilchenphysik

T 66: Neutrinos II

T 66.6: Vortrag

Mittwoch, 22. März 2023, 17:05–17:20, POT/0251

Recent developments for an automated krypton assay in xenon at the ppq level — Steffen Form, •Matteo Guida, Robert Hammann, Ying-Ting Lin, Hardy Simgen, and Jonas Westermann — Max-Planck Institut für Kernphysik, Heidelberg, Germany

The beta-decaying isotope ⁸⁵Kr is one of the main intrinsic background components in liquid xenon (LXe) dark matter detectors. Via purification techniques, a krypton-in-xenon concentration below 100 ppq (parts per quadrillion) can routinely be achieved. The rare gas mass spectrometer (RGMS), at Max-Planck Institut für Kernphysik, provides a measurement of the krypton concentration of an extracted xenon gaseous sample taken directly from the experiment. First, krypton is separated from xenon using a cryogenic gas-solid chromatography system. Then, the amount of krypton is quantified using a mass spectrometer. The system has achieved a detection limit of 8 ppq. A fully automatic rare gas mass spectrometer (Auto-RGMS) is under construction for the krypton assay of future low-background LXe detectors. Without human effort, the automatic operation is going to enable more frequent krypton monitoring and provide more robust results. The plan is to introduce a novel adsorbent for the chromatography system to increase the xenon sample size and further push down the krypton detection limit. The new solutions show a large enhancement in the separation power at a given temperature and in the linearity of the adsorption isotherms. The progress to select a new adsorbent and optimize the working point of Auto-RGMS will be discussed.