Münster 2017 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 64: Experimentelle Techniken der Astroteilchenphysik 3

T 64.3: Vortrag

Dienstag, 28. März 2017, 17:15–17:30, VSH 18

Investigation of tetraphenyl butadiene coatings for wavelength shifting fibers for the liquid argon veto in GERDA — •Julian Kratz for the GERDA collaboration — Physik-Department and Excellence Cluster Universe, Technische Universität München, James-Franck-Straße 1, 85748 Garching

Liquid argon is a widely used medium in particle detectors, especially in the field of neutrino physics and dark matter searches. Liquid argon has a high photon yield of approximately 40 000 photons/MeV with the wavelengths of the photons in the vacuum ultraviolet region around 127 nm. The most common way of detecting the scintillation light of liquid argon is to shift it to longer wavelengths, where light detectors are sensitive. The GERDA (GERmanium Detector Array) neutrinoless double beta decay experiment uses liquid argon scintillation light to reject events where particles deposit part of their energy outside the germanium detectors in the surrounding liquid argon. For this purpose wavelength shifting (WLS) fibers with silicon photomultipliers (SiPM) connected to the end are coated with tetraphenyl butadiene (TPB). TPB has been demonstrated to be extremely efficient in converting vacuum ultraviolet photons into visible ones. This work focuses on the TPB coatings applied on WLS fibers for the light yield optimization of the liquid argon veto in GERDA. The work was partly funded by BMBF.