Dortmund 2021 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 97: Experimental techniques in astroparticle physics IV

T 97.9: Vortrag

Donnerstag, 18. März 2021, 18:00–18:15, Tv

Liquid Argon Purification for LEGEND-200 — •Christoph Vogl¹, Malgorzata Haranczykl², Patrick Krause¹, Tomasz Mroz², Laszlo Papp¹, Stefan Schönert¹, and Grzegorz Zuzel² — ¹Physik Department, Technische Universität München, Garching — ²Institute of Physics, Jagiellonian University, Krakow, Poland

Experiments searching for rare events frequently use liquid argon (LAr) as scintillating detection medium. The first phase of the Large Enriched Germanium Experiment for Neutrinoless double beta Decay (LEGEND), L200, is currently being commissioned. Up to 200 kg of bare germanium detectors will be deployed in LAr. The LAr will serve as cooling medium as well as passive shielding and will be instrumented to serve as a detector by itself. The instrumentation is composed of light guiding fibers connected to silicon photomultipliers detecting scintillation light. The scintillation properties of LAr are worsened by electronegative impurities in the argon such as oxygen, water and nitrogen due to quenching and absorption processes. To reduce the amount of impurities, a pre-loading liquid-phase argon purification system was designed and is currently being tested and commissioned. In this talk, the current status of the system is presented. This work has been supported in part by the German Federal Ministry for Education and Research (BMBF).