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Publication - Professor Jonas Rademacker

    Status of the TORCH time-of-flight project


    Harnew, N, Bhasin, S, Blake, T, Brook, NH, Conneely, T, Cussans, D, van Dijk, M, Forty, R, Frei, C, Gabriel, EP, Gao, R, Gershon, TJ, Gys, T, Hadavizadeh, T, Hancock, TH, Kreps, M, Milnes, J, Piedigrossi, D & Rademacker, J, 2018, ‘Status of the TORCH time-of-flight project’. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment.


    TORCH is a time-of-flight detector, designed to provide charged π∕K particle identification up to a momentum of 10GeV/c for a 10m flight path. To achieve this level of performance, a time resolution of 15 ps per incident particle is required. TORCH uses a plane of quartz of 1 cm thickness as a source of Cherenkov photons, which are then focussed onto square Micro-Channel Plate Photomultipliers (MCP-PMTs) of active area 53 × 53mm2, segmented into 8 × 128 pixels equivalent. A small-scale TORCH demonstrator with a customised MCP-PMT and associated readout electronics has been successfully operated in a 5GeV/c mixed pion/proton beam at the CERN PS facility. Preliminary results indicate that a single-photon resolution better than 100ps can be achieved. The expected performance of a full-scale TORCH detector for the Upgrade II of the LHCb experiment is also discussed.

    Full details in the University publications repository