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Publication - Professor Jonas Rademacker

    Testbeam studies of a TORCH prototype detector

    Citation

    Brook, NH, García, LC, Conneely, TM, Cussans, D, van Dijk, MW, Föhl, K, Forty, R, Frei, C, Gao, R, Gys, T, Hancock, TH, Harnew, N, Lapington, J, Milnes, J, Piedigrossi, D, Rademacker, J & García, AR, 2018, ‘Testbeam studies of a TORCH prototype detector’. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol 908., pp. 256-268

    Abstract

    TORCH is a novel time-of-flight detector that has been developed to provide charged-particle identification between 2 and 10 GeV/c momentum. TORCH combines arrival times from multiple Cherenkov photons produced within a 10 mm-thick quartz radiator plate, to achieve a 15 ps time-of-flight resolution per incident particle. A customised Micro-Channel Plate photomultiplier tube (MCP-PMT) and associated readout system utilises an innovative charge-sharing technique between adjacent pixels to obtain the necessary 70 ps time resolution of each Cherenkov photon. A five-year R&D programme has been undertaken, culminating in the construction of a small-scale prototype TORCH module. In testbeams at CERN, this prototype operated successfully with customised electronics and readout system. A full analysis chain has been developed to reconstruct the data and to calibrate the detector. Results are compared to those using a commercial Planacon MCP-PMT, and single photon resolutions approaching 80 ps have been achieved. The photon counting efficiency was found to be in reasonable agreement with a GEANT4 Monte Carlo simulation of the detector. The small-scale demonstrator is a precursor to a full-scale TORCH module (with a radiator plate of 660×1250×10mm3), which is currently under construction.

    Full details in the University publications repository