TORCH is a time-of-flight detector, designed to provide charged pi/K particle identification up to a momentum of 10 GeV/c for a 10 m flight path. To achieve this level of performance, a time resolution of 15 ps per incident particle is required. TORCH uses a plane of quartz of 1 cm thickness as a source of Cherenkov photons, which are then focussed onto square Micro-Channel Plate Photomultipliers (MCP-PMTs) of active area 53 x 53 mm^2, segmented into 8 x 128 pixels equivalent. A small-scale TORCH demonstrator with a customised MCP-PMT and associated readout electronics has been successfully operated in a 5 GeV/c mixed pion/proton beam at the CERN PS facility. Preliminary results indicate that a single-photon resolution better than 100 ps can be achieved. The expected performance of a full-scale TORCH detector for the Upgrade II of the LHCb experiment is also discussed.
@article{arxiv.1812.09773,
title = {Status of the TORCH time-of-flight project},
author = {Neville Harnew and Srishti Bhasin and Thomas Blake and Nicholas Brook and Tom Conneely and David Cussans and Maarten van Dijk and Roger Forty and Christoph Frei and Emmy Gabriel and Rui Gao and Timothy Gershon and Thierry Gys and Tom Hadavizadeh and Thomas Hancock and Michel Kreps and James Milnes and Didier Piedigrossi and Jonas Rademacker},
journal= {arXiv preprint arXiv:1812.09773},
year = {2018}
}
Comments
9 pages, 6 figures, Paper submitted to Nuclear and Methods A : Proceedings of the 10th International Workshop on Ring Imaging Cherenkov Detectors (RICH 2018), Moscow, Russia, July 29 to August 4 2018