Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 7: Direkte Suche nach Dunkler Materie I

T 7.2: Talk

Monday, March 25, 2019, 16:20–16:35, H09

Towards a hermetic TPC for the DARWIN experiment — •Julia Dierle — Hermann-Herder-Straße 3, 79104 Freiburg

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 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 volume which must thus be enclosed in an (almost) liquid- and gas-tight shell. A small residual xenon flow from the purified target to the outside volume is expected. We report on the status and upcoming milestones towards construction and operation of such a hermetic TPC.