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As a prototype detector for the SHiP Surrounding Background Tagger (SBT), weconstructed a cell (120 cm x 80 cm x 25 cm) made from corten steel that isfilled with liquid scintillator (LS) composed of linear alkylbenzene (LAB) and2,5-diphenyloxazole (PPO). The detector is equipped with twoWavelength-shifting Optical Modules (WOMs) for light collection of the primaryscintillation photons. Each WOM consists of an acrylic tube that is dip-coatedwith a wavelength-shifting layer on its surface. Via internal total reflection,the secondary photons emitted by the molecules of the wavelength shifter areguided to a ring-shaped array of 40 silicon photomultipliers (SiPMs) coupled tothe WOM for light detection. The granularity of these SiPM arrays provides aninnovative method to gain spatial information on the particle crossing point.Several improvements in the detector design significantly increased the lightyield with respect to earlier proof-of-principle detectors. We report on theperformance of this prototype detector during an exposure to high-energypositrons at the DESY II test beam facility by measuring the collectedphotoelectron yield and the signal time-of-arrival in each of the SiPM arrays.Results on the detection efficiency and the reconstructed energy deposition ofthe incident positrons are presented, as well as the spatial and timeresolution of the detector. These results are then compared to Monte Carlosimulations.

Performance of a First Full-Size WOM-Based Liquid Scintillator Detector Cell as Prototype for the SHiP Surrounding Background Tagger