Status of the TORCH time-of-flight detector

T. Hadavizadeh, S. Bhasin, T. Blake, N. Brook, M. F. Cicala, T. Conneely, D. Cussans, R. Forty, C. Frei, E. P.M. Gabriel, R. Gao, T. Gershon, T. Gys, T. H. Hancock, N. Harnew, M. Kreps, J. Milnes, D. Piedigrossi, J. Rademacker, M. van Dijk

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearch


TORCH is a novel time-of-flight detector, designed to provide π/K particle identification up to 10 GeV/c momentum over a 10 m flight path. Based on the DIRC principle, Cherenkov photons are produced in a quartz plate of 10 mm thickness, where they propagate to the periphery of the plate by total-internal reflection. There the photons are focused onto an array of micro-channel plate photomultipliers (MCP-PMTs) which measure their arrival times and spatial positions. A time resolution of 70 ps per detected Cherenkov photon is expected, which results in a time-of-flight resolution of 15 ps, given typically 30 detected photons per track. For a future application, a full-scale TORCH detector has been proposed for the future LHCb upgrade, which comprises 18 modules with 198 MCP-PMTs. To demonstrate the TORCH principle, a half-height (1250 × 660 × 10 mm3) prototype module has been tested in a 8 GeV/c mixed proton-pion beam at the CERN PS. Customised 53 ×53 mm2 MCP-PMTs of effective granularity 128 ×8 pixels have been employed, which have been developed in collaboration with an industrial partner. The single-photon timing performance and photon yields have been measured and are close to specification, demonstrating the TORCH concept.

Original languageEnglish
Title of host publicationpro
Number of pages8
Publication statusPublished - 2019
Externally publishedYes
EventEuropean Physical Society Conference on High Energy Physics, 2019 - International Convention Center of Ghent / Ghent University, Ghent, Belgium
Duration: 10 Jul 201917 Jul 2019

Publication series

NameProceedings of Science
PublisherSissa Medialab, SRL
ISSN (Print)1824-8039


ConferenceEuropean Physical Society Conference on High Energy Physics, 2019
Abbreviated titleEPS-HEP 2019
OtherThe European Physical Society Conference on High Energy Physics (EPS-HEP) is one of the major international conferences that reviews the field every second year since 1971 and is organized by the High Energy and Particle Physics Divison of the European Physical Society.
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