Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 13: Detectors 2 (scintillators, other)

T 13.5: Talk

Monday, March 4, 2024, 17:00–17:15, Geb. 30.23: 2/17

The "LowRad"-project’s cryogenic radon distillation column and heat pump development — •Philipp Schulte, Lutz Althüser, Volker Hannen, Christian Huhmann, David Koke, Andria Michael, Patrick Alexander Unkhoff, Daniel Wenz, and Christian Weinheimer — Institute for Nuclear Physics, University of Münster

In sense of continuous background reduction in dark matter research, the ongoing "LowRad"-project aims to develop the technology for the next generation of radon and krypton distillation columns. To achieve the science goals of future dark matter detector it is required to reduce the concentration of radon in a 40-tonne liquid xenon detector to less than <0.1 µBq/kg - an approximately tenfold reduction compared to the XENONnT limit of 0.8 µµBq/kg. To attain this reduction, the throughput flow of the column must be increased to 750 kg/h, necessitating 21 kW power in both the evaporation of xenon during the thermal separation process and the reliquefaction of radon-depleted xenon. Therefore, a heat pump concept is needed hermetically separated from the primary circuit of the column. This talk will highlight the theoretical design, projected performance, and initial laboratory setups of this heat pump system.

Acknowledging the support of the ERC AdG project "LowRad" (101055063).