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Plastic scintillator detectors have been extensively used in particle physicsexperiments for decades. A large-scale detector is typically arranged as anarray of staggered long bars which provide a fast trigger signal and/orparticle identification via time-of-flight measurements. Scintillation light iscollected by photosensors coupled to both ends of every bar. In this article,we present our study on a direct replacement of commonly used vacuumphotomultiplier tubes (PMTs) by arrays of large-area silicon photomultipliers(SiPMs). An SiPM array which is directly coupled to the scintillator bulk, hasa clear advantage with respect to a PMT: compactness, mechanical robustness,high PDE, low operation voltage, insensitivity to magnetic field, low materialbudget, possibility to omit light-guides. In this study, arrays of eight 6 x 6mm2 area SiPMs were coupled to the ends of plastic scintillator bars with 1.68m and 2.3 m lengths. An 8 channel SiPM anode readout ASIC (eMUSIC) was used forthe readout, amplification and summation of signals of individual SiPMs. Timingcharacteristics of a large-scale detector prototype were studied in test-beamsat the CERN PS. This technology is proposed for the ToF system of the ND280/T2KII upgrade at J-PARC and the timing detector of the SHiP experiment at the CERNSPS.

Plastic scintillator detector with the readout based on an array of large-area SiPMs for the ND280/T2K upgrade and SHiP experiments