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T: Fachverband Teilchenphysik

T 53: Dark Matter II

T 53.4: Vortrag

Mittwoch, 1. April 2020, 17:15–17:30, H-HS XIV

The LEGEND Liquid Argon Monitoring Apparatus (LLAMA) — •Mario Schwarz, Patrick Krause, Laszlo Papp, and Stefan Schönert — Physik-Department, Technische Universität München, Garching, Germany

Large volume liquid argon (LAr) detectors require a precise assessment of optical key parameters for both modeling and interpreting the data. Looking at neutrinoless double beta decay experiments, both the state-of-the-art GERDA experiment as well as the next-generation LEGEND detector employ the LAr technology as part of their active veto system. Therefore, modeling the LAr veto efficiency requires knowledge of the optical parameters in LAr, which depend on the actual impurity concentration in the liquid. To this end, a dedicated setup has been designed for in-situ measurements of the light yield, the triplet lifetime and the attenuation length of the 128 nm primary emission wavelength. The setup uses a triggered LAr scintillation light source and will be used both to measure the LAr properties of GERDA as well as a monitor for the LAr in LEGEND, where it will reside permanently. Hence, it is referred to as the LEGEND Liquid Argon Monitoring Apparatus (LLAMA).

An overview of LLAMA, as well as results of the characterization and testing campaign carried out at TUM will be shown.

The work has been supported in part by the German Federal Ministry for Education and Research (BMBF) Verbundforschung.