Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 31: Direkte Suche nach Dunkler Materie II

T 31.9: Talk

Tuesday, March 26, 2019, 18:00–18:15, H09

Radon removal for the XENONnT dark matter experiment — •Michael Murra for the XENON collaboration — Institut für Kernphysik, Münster

The next-generation dark matter experiment XENONnT utilizes about 8.4 tonnes of liquid xenon for the direct search of Weakly Interacting Massive Particles (WIMPS). Intrinsic radioactive contaminants in the liquid xenon such as Kr-85 and Rn-222 will be the main source of background. Both noble gas species can be removed by cryogenic distillation, employing the differences in vapor pressure between krypton and radon with respect to xenon. While krypton can be reduced once before the start of the dark matter search with the existing krypton distillation column of XENON1T, radon is continously emanating from the detector components. Therefore, a new high-flux radon removal system is under developement for XENONnT. Besides the separation performance, the main challenge is an efficient thermodynamic design.

This talk will present the design along with first measurements with a prototype setup.

The project is funded by BMBF under contract 05A17PM2.