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Bhasin, S.; Blake, T.; Brook, N.H.; Cicala, M.F.; Conneely, T.; Cussans, D.; van Dijk, M.W.U.; Forty, R.; Frei, C.; Gabriel, E.P.M.; Gao, R.; Gershon, T.; Gys, T.; Hadavizadeh, T.; Hancock, T.H.; Harnew, N.; Jones, T.; Kreps, M.; Milnes, J.; Piedigrossi, D.; Rademacker, J.; Smallwood, J.C.
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 05/2023, Letnik: 1050Journal Article
TORCH is a novel time-of-flight detector, designed to provide charged particle identification of pions, kaons and protons in the momentum range 2–20 GeV/c over a 9.5 m flight path. A detector module, comprising a 10 mm thick quartz plate, provides a source of Cherenkov photons which propagate via total internal reflection to one end of the plate. Here, the photons are focused onto an array of custom-designed Micro-Channel Plate Photo-Multiplier Tubes (MCP-PMTs) which measure their positions and arrival times. The target time resolution per photon is 70 ps which, for 30 detected photons per charged particle, results in a 10–15 ps time-of-flight resolution. A 1.25 m length TORCH prototype module employing two MCP-PMTs has been developed, and tested at the CERN PS using a charged hadron beam of 8 GeV/c momentum. The construction of the module, the properties of the MCP-PMTs and the readout electronics are described. Measurements of the collected photon yields and single-photon time resolutions have been performed as a function of particle entry points on the plate and compared to expectations. These studies show that the performance of the TORCH prototype approaches the design goals for the full-scale detector.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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