Speaker
Description
The plans for LHCb upgrade II in the HL LHC era include complementing the experiment’s particle ID capabilities in the low momentum region up to 10-15 GeV with the novel TORCH time of flight detector. TORCH is designed to provide 15 ps timing resolution for charged particles, resulting in K/pi (p/K) particle identification up to 10 (15) GeV/c momentum over a 10 m flight path. 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. We present the latest TORCH design for the LHCb upgrade II Framework Design Report, including a novel, computationally efficient TORCH pattern recognition algorithm, and the simulated particle ID performance in LHCb upgrade II high luminosity running conditions. As a proof of concept, a half-scale (660 x 1250 x 10 mm^3) TORCH demonstrator module, instrumented with customised MCP_PMTs, has been tested in a mixed proton-pion beam at the CERN PS. The MCP-PMTs with an active area of 53 x 53 mm^2 and a granularity of 64 x 8 pixels have been developed in collaboration with an industrial partner (Photek). We present a comprehensive analysis of the testbeam data, complemented by lab-based performance measurements of individual TORCH components. A fully instrumented TORCH prototype module is under construction.
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