The TORCH time-of-flight detector

Harnew, N, Gao, R, Hadavizadeh, T, Hancock, TH, Smallwood, JC, Brook, N ORCID: https://orcid.org/0000-0002-1818-0113, 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.