Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 40: Detectors 5 (scintillators)

T 40.3: Talk

Tuesday, March 5, 2024, 16:30–16:45, Geb. 30.23: 2/17

Testbeam measurements with the first multi-cell prototype of the Surrounding Background Tagger of the proposed 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 interactions in the decay vessel walls and its surrounding. SBT is based on liquid scintillator (LAB-PPO) filled cells. Light collection is performed through Wavelength-Shifting Modules (WOMs) made of PMMA and dip-coated with a wavelength shifting dye. We present results obtained with the first multi-cell prototype, consisting of four cells, and implemented with improvements over the previous design of a one-cell prototype, which was successfully tested with positrons in October 2022 at DESY, Hamburg [arXiv:2311.07340]. In October 2023, the four-cell prototype has been tested with muons and electrons at CERN's PS. Each cell was equipped with two WOM tubes, equidistant from the center along the vertical axis. A study about timing resolution of the detector was performed to achieve a better comprehension on the possibility of event reconstruction in the final SBT detector. In parallel, an accurate and detailed Geant4 simulation of the prototype has been built, including the simulation of the electronic signal of the detector. The comparison of the simulation results with the data from the testbeam allows us to gather further information about the detector response and the quality of the built prototype.

Keywords: SHiP; Liquid scintillator; WOM; Muon; Geant4