PoS - Proceedings of Science
Volume 364 - European Physical Society Conference on High Energy Physics (EPS-HEP2019) - Detector R&D and Data Handling
Status of the TORCH time-of-flight detector
T. Hadavizadeh,* S. Bhasin, T. Blake, N.H. Brook, M.F. Cicala, T. Conneely, D. Cussans, R. Forty, C. Frei, R. Gao, E. Gabriel, T. Gershon, T. Gys, T. Hancock, N. Harnew, M. Kreps, J. Milnes, D. Piedigrossi, J. Rademacker, M.W.U. Van Dijk
*corresponding author
Full text: Not available
TORCH is a novel time-of-flight detector, designed to provide $\pi$/K particle identification up to 10$\,\text{GeV}/c$ 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 ($1250\times660\times10 \,\text{mm}^3$) prototype module has been tested in a 8$\,\text{GeV}/c$ mixed proton-pion beam at the CERN PS. Customised $53\times53\,\text{mm}^2$ MCP-PMTs of effective granularity $128\times8$ 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.
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