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T: Fachverband Teilchenphysik

T 76: Dark Matter III

T 76.8: Vortrag

Donnerstag, 2. April 2020, 18:15–18:30, H-HS XIV

A cryogenic distillation system for continuous radon removal at XENONnT — •Denny Schulte for the XENON collaboration — Institut für Kernphysik, Westfälische Wilhelms- Universität Münster

The forthcoming XENONnT experiment is a next generation 8 t liquid xenon detector for the direct detection of dark matter in the form of the Weakly Interacting Massive Particle (WIMP). After extensive efforts of material selection and cleaning, the intrinsic contamination of the ultra-pure xenon by Rn-222 will be the main background. This radioactive impurity can be removed by cryogenic distillation making use of the difference in vapor pressure between radon and xenon. Since radon is continuously emanated from detector components, the reduction depends not only on the separation efficiency but also on the recirculation speed. Therefore, a high flux distillation system is under developement.

This talk will focus on the design and the technical challenges of building a removal system with a 20 times larger throughput compared to the previous distillation column used at the XENON1T experiment.

The project is funded by BMBF under contract 05A17PM2.