Feb 18 – 22, 2019
Vienna University of Technology
Europe/Vienna timezone

Beam tests of a large-scale TORCH time-of-flight demonstrator

Feb 20, 2019, 12:20 PM


Talk Cherenkov Detectors Cherenkov


Thomas Henry Hancock (University of Oxford (GB))


The TORCH time-of-flight detector is designed to provide particle identification over the momentum range 2–10 GeV/c over large areas. The detector exploits prompt Cherenkov light produced by charge particles traversing a 10 mm thick quartz plate. The photons propagate via total-internal reflection and are focussed onto a detector plane comprising position-sensitive micro-channel plate (MCP) detectors. The goal is to achieve a single-photon timing resolution of around 70 ps, giving a timing precision of 15 ps per charged particle by combining the information from around 30 detected photons. The MCP-PMT detectors have been developed with a commercial partner (Photek), leading to the delivery of a square tube of active area 53 x 53mm^2 with 8 x 128 pixels equivalent. A large-scale demonstrator of TORCH with a quartz plate of dimensions 660 x 1250 mm^2, read out by a pair of MCP-PMTs with custom readout electronics, has been verified in beam tests at the CERN PS. Preliminary results indicate that excellent single-photon timing resolution can be achieved by employing a data-driven calibration. The projected performance of a full-scale TORCH detector at the LHCb experiment will also be presented.

Primary author

Thomas Henry Hancock (University of Oxford (GB))


Prof. Neville Harnew (University of Oxford (GB)) Jonas Rademacker (University of Bristol (GB)) Didier Piedigrossi (CERN) James Milnes (Photek Ltd) Michal Kreps (University of Warwick (GB)) Tom Hadavizadeh (University of Oxford (GB)) Thierry Gys (CERN) Timothy Gershon (University of Warwick (GB)) Rui Gao (University of Oxford (GB)) Emmy Pauline Maria Gabriel (The University of Edinburgh (GB)) Christoph Frei (CERN) Roger Forty (CERN) Maarten Van Dijk (University of Bristol (GB)) David Cussans (University of Bristol (GB)) Thomas Conneely (Photek LTD) Nicholas Brook (University of London (GB)) Thomas Blake (University of Warwick) Srishti Bhasin (University of Bristol (GB))

Presentation materials