Test-beam demonstration of a TORCH prototype module

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

Research output: Contribution to journalConference articlepeer-review


The TORCH time-of-flight detector is designed to provide a 15 ps timing resolution for charged particles, resulting in π/K particle identification up to 10 GeV/c momentum over a 10 m flight path. Cherenkov photons, produced in a quartz plate of 10 mm thickness, are focused onto an array of micro-channel plate photomultipliers (MCP-PMTs) which measure the photon arrival times and spatial positions. A half-scale (660 × 1250 × 10 mm3) TORCH demonstrator module has been tested in an 8 GeV/c mixed proton-pion beam at CERN. Customised square MCP-PMTs of active area 53 × 53 mm2 and granularity 64 × 64 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 as a function of beam position in the radiator, giving measurements which are consistent with expectations. The expected performance of TORCH for high luminosity running of the LHCb Upgrade II has been simulated.

Original languageEnglish
Article number012004
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 6 Dec 2022
Externally publishedYes
Event2021 International Conference on Technology and Instrumentation in Particle Physics, TIPP 2021 - Virtual, Online
Duration: 23 May 202128 May 2021

Bibliographical note

Funding Information:
The support is acknowledged of the Science and Technology Research Council, UK, grant number ST/P002692/1, and of the European Research Council through an FP7 Advanced Grant (ERC-2011-AdG 299175-TORCH).

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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