The TORCH time-of-flight detector

Harnew, N, Gao, R, Hadavizadeh, T, Hancock, TH, Smallwood, JC, Brook, NH, Bhasin, S, Cussans, D, Rademacker, J, Forty, R, Frei, C, Gys, T, Piedigrossi, D, van Dijk, MWU, Gabriel, EPM, Conneely, T, Milnes, J, Blake, T, Cicala, MF, Gershon, T, Jones, T and Kreps, M (2023) The TORCH time-of-flight detector. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment, 1048. p. 167991. ISSN 0168-9002

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Abstract

TORCH is a large-area time-of-flight (ToF) detector, proposed for the Upgrade-II of the LHCb experiment. It will provide charged hadron identification over a 2–20 GeV/c momentum range, given a 9.5m flight distance from the LHC interaction point. To achieve this level of performance, a 15ps timing resolution per track is required. A TORCH prototype module having a 1250×660×10mm3 fused-silica radiator plate and equipped with two MCP-PMTs has been tested in a 8GeV/c CERN test-beam. Single-photon time resolutions of between 70–100ps have been achieved, dependent on the beam position in the radiator. The measured photon yields agree with expectations.