Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 13: Detectors 2 (scintillators, other)

T 13.7: Talk

Monday, March 4, 2024, 17:30–17:45, Geb. 30.23: 2/17

A Xenon Cryogenic Distillation System for Krypton Removal in Next-Generation Dark Matter Experiments — •David Koke, Lutz Althüser, Volker Hannen, Christian Huhmann, Andria Michael, Philipp Schulte, Patrick Alexander Unkhoff, Daniel Wenz, and Christian Weinheimer — Universität Münster, Germany

Future dark matter experiments, such as DARWIN and XLZD, rely on liquid xenon detectors to probe WIMPs down to the neutrino fog. The prerequisite for the success of these experiments is a very low background, and therefore a very low krypton concentration. The LowRad project aims at developing a compact all-in-one xenon purification system for krypton, radon and electronegative impurities. The system’s key components include a distillation column for continuous online removal requiring a secondary distillation column as a concentrator, reaching a Kr concentration of below 30 ppq ^natKr/Xe. This innovative approach enables a reduction of the amount of offgas and an increase of the offgas concentration, both by a factor of 1000 in comparison to XENONnT, effectively achieving quasi-lossless operation. This krypton removal system paves the way for achieving the ultra-low backgrounds demanded by next-generation dark matter experiments. This work is supported by the ERC AdG project "LowRad" of C. Weinheimer (No. 101055063).

Keywords: Xenon; Distillation; Dark Matter