Dortmund 2021 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 72: Experimental techniques in astroparticle physics III

T 72.2: Vortrag

Mittwoch, 17. März 2021, 16:15–16:30, Tv

Radon removal system for the XENONnT experiment — •Denny Schulte, Michael Murra, Christian Huhmann, Philipp Schulte, and Christian Weinheimer for the XENON collaboration — Westfählische Wilhelms Universität, Münster, Germany

The direct dark matter search experiment XENONnT, located at Laboratori Nazionali del Gran Sasso, uses 8.3 tonnes of liquid xenon aiming for the direct detection of the Weakly Interacting Massive Particle (WIMP) and the search for other very rare processes. Intrinsic radioactive isotopes within the liquid xenon like Kr-85 and Rn-222 create the dominant electronic recoil background of the experiment and cannot be reduced by shielding or fiducialisation. A proven removal technique is cryogenic distillation using the different vapor pressures of krypton, radon and xenon. While the krypton removal can be done once before the detector is filled, radon is continously emanating from detector components. Therefore, a novel radon removal system based on an efficient thermodynamic concept ensuring a high xenon throughput has been developed and is now under commissioning at the XENONnT experiment.

This talk will zoom in on the thermodynamic idea and design along with first characterization measurements.

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