Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 70: Searches for Dark Matter II

T 70.4: Talk

Wednesday, March 17, 2021, 16:45–17:00, Tt

Towards a hermetic TPC for the DARWIN experiment — •Julia Dierle — Albert-Ludwigs-Universität, Freiburg, Germany

With its ambitious sensitivity to rare WIMP-nucleus interaction, the DARWIN experiment has to significantly exceed the already very low target-intrinsic background rates achieved by the currently leading dark matter experiments. These are dominated by radon which is constantly emanated from all detector surfaces. The concept of a hermetic TPC could complement approaches like radon distillation, material selection and surface treatment and contribute towards the goal of a radon-induced background rate of 0.1 µBq/kg. The hermetic TPC minimizes the surface being in direct contact with the active xenon target volume which must thus be enclosed in an almost liquid- and gas-tight shell. We report on the status and the first run of such a hermetic TPC prototype.