Erlangen 2026 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 18: Methods in Astroparticle Physics I

T 18.5: Vortrag

Montag, 16. März 2026, 17:15–17:30, KS 00.004

Performance of a cryogenic heat pump demonstrator for future liquid xenon observatories — •Philipp Schulte, Lutz Althüser, Robert Braun, Volker Hannen, Christian Huhmann, David Koke, Ying-Ting Lin, Patrick Unkhoff, Daniel Wenz, and Christian Weinheimer — Institut für Kernphysik, Universität Münster

Future liquid xenon (LXe) dark-matter detectors require detector backgrounds about ten times below the solar neutrino-induced background level. Achieving this demands 222Rn concentrations in LXe <0.1 *Bq/kg (less than one 222Rn atom in 160 mol xenon). The ERC project *LowRad* develops high-throughput cryogenic distillation for radon removal, where xenon flow rates of ~1600 kg/h imply heating and cooling powers of O(60) kW at the column reboiler and condenser. To reduce the external cooling demand, a xenon-based cryogenic heat-pump demonstrator has been built and operated. This contribution will present its design and performance, achieving up to ~130 W cooling/heating power at 3.3 bar and 4.3 bar with an electrical input of ~390 W (COP *0.32). Implications for the design and integration of full-scale systems in future LXe observatories such as XLZD will be discussed. Acknowledging support of the ERC AdG *LowRad* (101055063).