Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 42: Detector Systems 1

T 42.3: Vortrag

Dienstag, 22. März 2022, 16:50–17:05, T-H27

Measurements of photon exit angles of Wavelength-Shifting Optical Modules used in a large-area liquid-scintillator detector — •Florian Rehbein for the SBT collaboration — RWTH Aachen University, Aachen, Germany

This contribution presents first laboratory measurements of the optical characteristics and the quality of a Wavelength-Sifting Optical Module (WOM) as foreseen for a liquid-scintillator-based large-area detector. Measurements of the photon exit angle distribution have been taken with a DSLR camera on a test stand that was built specifically for this purpose. Further, it will be discussed how systematic measurements and comparisons to simulations will help to examine the properties of the module. WOMS combine a well-designed light guide with a wavelength-shifting coating, presenting a novel optical sensor for numerous applications, first proposed for the large-volume extension of the IceCube detector. WOMs are also foreseen as photon detectors in the Surround Background Tagger (SBT) in SHiP (Search for Hidden Particles), a proposed general-purpose fixed target experiment at the SPS accelerator of the CERN Facility. The SBT acts as a discriminator against external particle interactions and is composed of many cells utilizing liquid scintillator and tube-shaped WOMs made of PMMA to detect traversing particles. The coating of the WOMs absorbs the scintillation photons and re-emits wavelength-shifted photons, which are then detected by an array of SiPMs coupled to one end of the WOM. Supported by the DFG.