Köln 2025 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HK: Fachverband Physik der Hadronen und Kerne

HK 23: Poster

HK 23.42: Poster

Dienstag, 11. März 2025, 17:30–19:00, Foyer Physik

"LowRad"-project: Background Reduction for next generation Dark Matter experiments — •Hannah Ginkel, Lutz Althüser, Robert Braun, Volker Hannen, Christian Huhmann, David Koke, Philipp Schulte, Patrick Alexander Unkhoff, Daniel Wenz, and Christian Weinheimer — Institute for Nuclear Physics, University of Münster

Next-generation dark matter experiments using liquid xenon are advancing the search for Weakly Interacting Massive Particles (WIMPs), a leading dark matter candidate, as well as other rare events such as solar neutrinos, neutrinoless double beta decay, and solar axions, among others. Achieving ultra-low background event rates is essential for probing WIMPs down to the neutrino fog. The "LowRad"-project aims to reduce the background levels below 0.1  µ Bq/kg by developing innovative techniques, such as active cryogenic distillation methods for the next generation of krypton and radon removal systems (RRS), utilizing differences in vapor pressure. A cryogenic heat pump is being developed to handle the increased throughput of the RRS and provide O(20) kW for the evaporation and reliquefaction processes. Current krypton removal systems suffer from substantial off-gas losses of several tonnes of xenon, hindering continuous operation during data-taking. To address this, LowRad is developing a staged distillation, which aims to reduce the off-gas losses during krypton removal to a few kilograms over the lifetime of the XLZD observatory. This poster presents the current status of the developed systems.

Supported by the ERC Advanced Grant "LowRad" (101055063).

Keywords: cryogenic distillation; heat pump; krypton reduction; radon reduction; WIMP