Karlsruhe 2024 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 40: Detectors 5 (scintillators)

T 40.4: Vortrag

Dienstag, 5. März 2024, 16:45–17:00, Geb. 30.23: 2/17

Reflective Coating in the SHiP Surround Background Tagger — •Patrick Deucher, Annika Hollnagel, Manuel Böhles, and Michael Wurm for the SHiP-SBT collaboration — Johannes Gutenberg Universität Mainz, Institut für Physik, Staudingerweg 7, 55128 Mainz

The Surround Background Tagger (SBT) is a liquid-scintillator-based background detector in the SHiP Experiment. Divided into segments, it envelops the vacuum decay vessel made of Corten Steel. WOMs with SiPM arrays are used for light detection with a high angular acceptance. The efficiency of such a detector type can be increased by optimizing the light collection, enhancing the transparency of the scintillator (purification and addition of different fluorophores) and increasing the reflectivity of the inner detector walls. Following results of Photon Transport Simulations that indicate an increase of light yield by a factor of 4-5 by applying a highly diffuse reflector to the inner walls of a detector, a Bariumsulfate-based reflective coating ("OPRC" by Berghof Fluoroplastic Technology GmbH) has been developed. This talk will discuss results of a second large-scale application of the reflective coating in a 4-cell liquid scintillator detector for the test beam 2023 at CERN. Several improvements were made compared to the first application in a 1-cell prototype in 2022, such as using a rust protection primer to prevent yellowing of the coating through a reaction with the Corten Steel. This work is supported by the BMBF Project 05H2018 - High-D and the Cluster of Excellence PRISMA+.

Keywords: sbt; detector optimization; liquid scintillator