Gießen 2024 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 3: Instrumentation I

HK 3.1: Gruppenbericht

Montag, 11. März 2024, 16:45–17:15, HBR 19: C 1

The Surrounding Background Tagger for the SHiP Experiment at CERN — •Horst Fischer for the SHiP-SBT collaboration — Albert-Ludwigs-Universität Freiburg

The Search for Hidden Particles (SHiP) experiment is an ambitious initiative designed as a dedicated proton beam dump facility located in the ECN3 cavern at CERN. The overall goal of this experiment is to explore the realm of long-lived, neutral, feebly interacting particles outside the Standard Model, produced by the collision of 400 GeV/c protons with a robust heavy metal target. Over a 15-year time span, the SHiP experiment aims to accumulate an impressive 6x10^20 protons on target, employing a sophisticated detector setup strategically designed to suppress potential background to virtually negligible levels. The Surrounding Background Tagger (SBT) will be a cornerstone of background suppression. It is designed to reject background by detecting charged particles that either enter the Hidden Sector vacuum decay vessel from external sources or arise from deep inelastic interactions within the vacuum vessel walls. To this end the SBT detector encloses ae expansive 50-meter-long decay vessel utilizing liquid scintillator (LAB-PPO) filled cells. Light capture is facilitated by Wavelength shifting Optical Modules (WOMs) made of PMMA and that are coated with a wavelength shifting dye and equipped with silicon photomultipliers. In 2023, a four-cell prototype detector was developed for a test beam campaign at CERN. We will report on the results of the test beam exposure and, as well as the ongoing R&D work.

Keywords: liquid scintillator (LAB-PPO); Wavelength shifting Optical Modules (WOMs); silicon photomultipliers