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T: Fachverband Teilchenphysik

T 18: Methods in Astroparticle Physics I

T 18.1: Vortrag

Montag, 16. März 2026, 16:15–16:30, KS 00.004

Large-scale TPB Vacuum Evaporation for the LEGEND-1000 Liquid Argon Veto — •Lorenzo Pietropaoli¹, Konstantin Gusev^1,2, Laszlo Papp¹, Nadezda Rumyantseva^1,2, and Stefan Schönert¹ — ¹Department of Physics, TUM School of Natural Sciences, Technical University of Munich, 85748 Garching b. München, Germany — ²Dubna, Russia

LEGEND-1000 searches for 0νββ-decay using HPGe detectors in instrumented LAr. A critical background suppression component is the LAr instrumentation, utilizing scintillating fibers coated with Tetraphenyl Butadiene (TPB) and read out by SiPMs. TPB acts as a wavelength shifter, converting 128 nm VUV scintillation light from LAr to ∼430 nm blue light, which is absorbed by green wavelength-shifting (and scintillating) fibers and guided to SiPMs for detection.

We present the design and status of the new LEGEND-1000 TPB evaporator. Building on the LEGEND-200 experience, the system features a 2.3 m tall vacuum chamber designed for the simultaneous, uniform coating of 9 fiber modules with lengths up to 1.6 m. The setup is under construction and assembly in a dedicated new clean room facility at TUM. This talk covers the technical design, the scaling of the evaporation process, and the current status of the commissioning.

We acknowledge support from the DFG under Germany’s Excellence Strategy – EXC 2094 (ORIGINS), through the Sonderforschungsbereich SFB 1258. We acknowledge support by the BMFTR Verbundprojekt 05A2023 (LEGEND).

Keywords: LEGEND; Neutrinoless; Argon; TPB; Scintillation