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T: Fachverband Teilchenphysik

T 49: Detectors IV (Scintillators)

T 49.3: Talk

Wednesday, April 2, 2025, 16:45–17:00, VG 1.101

Testbeam measurements with prototypes of the Surround- ing Background Tagger of the SHiP experiment — •Alessia Brignoli for the SHiP-SBT collaboration — Humboldt Universität zu Berlin

The Surrounding Background Tagger (SBT) is a crucial part of the SHiP experiment to suppress background from muons entering the decay vessel of the experiment or from muon/neutrino inelastic inter- actions inside the decay volume and its surroundings. The SBT is based on liquid scintillator (LAB+PPO) filled cells. Light collection is performed through PMMA Wavelength-Shifting Optical Modules (WOMs), optically coupled to an array of 40 SiPMs. We present re- sults obtained with different prototypes. The first four-cells prototype, improving of a one-cell prototype that was tested with positrons in Oc- tober 2022 at DESY, was tested in spring 2024 with muons at CERN's PS. Three one-cell prototypes that were tested with muons in CERN's PS in November 2024. The different prototyes differ in the cell con- struction material, steel or aluminium, as well as the material used for increasing the inner walls reflectivity, crucial for the light collec- tion. For all the prototypes, each cell was equipped with two WOM tubes. The timing performance of the detector, which is important for the background rejection capabilities of the final SBT detector, was studied. In parallel, the comparison of data with Geant4-based photon transportation simulations results allows us to gather further information about the detector response and the quality of the built prototypes.

Keywords: SHiP; Surrounding Background Tagger; Timing Performance; Liquid Scintillator Detector