The TORCH time-of-flight detector

TORCH is a large-area time-of-flight (ToF) detector, proposed for the Upgrade-II of LHCb experiment. It will provide charged hadron identification over 2–20 GeV/c momentum range, given 9.5 m flight distance from LHC interaction point. To achieve this level performance, 15 ps timing resolution per track required. A prototype module having 1250×660×10 mm3 fused-silica radiator plate and equipped with two MCP-PMTs has been tested in 8 CERN test-beam. Single-photon time resolutions between 70–100 have achieved, dependent on beam position radiator. The measured photon yields agree expectations.