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T: Fachverband Teilchenphysik

T 45: Searches for Dark Matter I

T 45.8: Vortrag

Dienstag, 16. März 2021, 17:45–18:00, Tt

A 4 cylinder radon-free magnetically coupled piston pump for the XENONnT experiment — •Philipp Schulte, Denny Schulte, Christian Huhmann, Michael Murra, and Christian Weinheimer for the XENON collaboration — Institut für Kernphysik WWU, Münster, Germany

Since commercially available pumps often exhibit electronegative contamination from lubricants on internal components and cannot meet the requirements on radiopurity of low background noble gas experiments especially w.r.t. radon emanation, a special type of pump has been developed for the XENON1T dark matter project (E. Brown et al., EPJ C78 (2018) 604). The design uses a magnetic piston in a hermically sealed cylinder that is magnetically coupled to an outer set of permanent magnets, which are moved up and down. All materials, essentially stainless steel, copper and special high density plastic for the inner pistion sealings are selected for low radioactivity.

In order to further increase the performance for the usage in the high flux radon removal system of the subsequent XENONnT, the design was extended to a four cylinder magnetically coupled piston pump being used as compressors for a kind of heat pump. Moreover, these four-pump were synchronized in operation to a phase shifted movement such that fluctuations in pressure and flow are reduced to a minimum.

This talk is about the design of this type of pump, as well as the optimization and synchronization of the pump extension.

The project is funded by BMBF under contract 05A17PM2 and 05A20PM1.