Karlsruhe 2024 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 6: Methods in astroparticle physics 1

T 6.6: Vortrag

Montag, 4. März 2024, 17:15–17:30, Geb. 20.30: 2.067

Reflectivity measurements of PTFE with VUV light in liquid xenon — •Robert Braun, Johanna Jakob, Lutz Althueser, and Christian Weinheimer — Institute for Nuclear Physics, University of Münster, Germany

Rare event searches as performed with liquid xenon detectors demand a precise knowledge of the employed materials. Measurements of optical properties at the xenon scintillation wavelength in the vacuum UV (VUV) regime are required for accurate simulations and detector characterization. With the Reflectivity Setup in Münster, the angular dependent reflection properties of a sample under VUV light can be studied in a gaseous (GXe) or liquid xenon (LXe) environment.

Polytetrafluorethylen (PTFE) is used to encapsulate the active volume of all large scale LXe dark matter experiments. Among these experiments are the XENON1T and XENONnT experiments from which PTFE samples of the detector walls were studied in vacuum, GXe and LXe using this setup. This talk will report about the reflectivity measurements of the PTFE depending on its surface treatment and the surrounding material.

Keywords: Reflectivity; PTFE; XENON; liquid xenon; VUV