PoS - Proceedings of Science
Volume 390 - 40th International Conference on High Energy physics (ICHEP2020) - Parallel: Detectors for Future Facilities (incl. HL-LHC), R&D, Novel Techniques
Test-beam performance of a TORCH prototype module
M. Kreps,* S. Bhasin, T. Blake, N. 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, T. Jones, J. Milnes, D. Piedigrossi, J. Rademacker, J. Smallwood
*corresponding author
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Pre-published on: February 02, 2021
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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 $K/\pi$ $(p/K)$ 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.
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