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Karlsruhe 2024 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 121: Search for Dark Matter 6

T 121.6: Vortrag

Freitag, 8. März 2024, 10:15–10:30, Geb. 30.35: HSI

Coating based radon barriers for future liquid xenon detectors — •Florian Jörg, Giovanni Volta, and Hardy Simgen — Max-Planck-Institut für Kernphysik Heidelberg, Germany

Dual-phase liquid xenon time projection chambers have become a leading technology in the search for dark matter. These detectors must be operated under extremely low radioactive background conditions. Especially, the radioactive noble gas 222Rn, that is constantly released from material surfaces, must be suppressed to the level of only a few atoms.

We have been investigating techniques to suppress its release by sealing surfaces with thin coating layers. A thousandfold reduction of the radon release has been demonstrated on a 2×2 cm2-small stainless steel sample, that has been implanted with 226Ra at the ISOLDE facility at CERN. Following on the successful small-scale tests, the setup underwent an upgrade which allows coating of larger vessel-like samples. Besides the radon tightness of the coating layers, also their intrinsic radiopurity is now being assessed and first results will be shown.

Keywords: Liquid xenon (LXe); Time projection chambers (TPC); Radon mitigation; Low background physics; Surface coatings

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