Test-beam performance of a TORCH prototype module

Kreps, M, Bhasin, S, Blake, T, Brook, N ORCID: https://orcid.org/0000-0002-1818-0113, Cicala, MF, Conneely, T, Cussans, D, van Dijk, MWU, Forty, R, Frei, C, Gabriel, EPM, Gao, R, Gershon, T, Gys, T, Hadavizadeh, T, Hancock, TH, Harnew, N, Jones, T, Milnes, J, Piedigrossi, D, Rademacker, J and Smallwood, J (2021) Test-beam performance of a TORCH prototype module. In: 40th International Conference on High Energy physics (ICHEP2020), 28 July 2020 - 06 August 2020, Prague, Czech Republic.

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Abstract

The TORCH time-of-flight detector is designed to provide a 15 ps timing resolution for charged particles, resulting in K/p (p/K) particle identification up to momentum of about 10 (15) GeV/c over a 10 m flight distance. 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 TORCH demonstrator module instrumented with a customised MCP-PMTs has been tested at the CERN PS. The useful implementation for the particle identification in the LHCb experiment requires single-photon time resolution of 70 ps. The timing performance and photon yields have been measured as a function of beam position in the radiator, giving measurements which are approaching the required resolution. A possible TORCH design of the particle identification system in the LHCb experiment has been simulated and its potential for high luminosity running has been evaluated.