SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 74: Poster

HK 74.34: Poster

Donnerstag, 23. März 2023, 17:30–19:00, HSZ EG

Reflectivity measurements with VUV light in xenon and vacuum — •Robert Braun, Lutz Althüser, and Johanna Jakob for the XENON collaboration — Institut für Kernphysik, WWU Münster

Rare event searches as performed with liquid xenon (LXe) detectors demand a precise knowledge of the employed materials. Measurements of optical properties at the xenon scintillation wavelength in the VUV regime are required for accurate simulations and detector characterization. The Reflectivity Setup in Münster has a focused light beam from deuterium lamp with a VUV monochromator to select the wavelength and as detector a PMT capable of 290° angular movement, allowing to study the reflectivity and transmission properties of a sample. The sample is placed in a quartz tube and can be studied in vacuum, in gaseous or in liquid xenon, which is kept stable by the built-in coldhead.

In the past, the setup was used for transmission measurements of polytetrafluorethylen (PTFE) (JINST 15 (2020) P12021), which is a common material to encapsulate the active volume in LXe detectors as used by the XENON dark matter project. In the near future, the setup will be used for reflectivity measurements of PTFE samples from the XENONnT experiment. This poster gives an overview of the Reflectivity Setup in Münster and the reflectivity and transmission measurements taken with it.