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Testbeam studies of a TORCH prototype detector

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journal contribution
posted on 09.08.2019, 13:39 by NH Brook, LC García, TM Conneely, D Cussans, MWU van Dijk, K Föhl, R Forty, C Frei, R Gao, T Gys, TH Hancock, N Harnew, J Lapington, J Milnes, D Piedigrossi, J Rademacker, AR García
TORCH is a novel time-of-flight detector that has been developed to provide charged-particle identification between 2 and 10 GeV/c momentum. TORCH combines arrival times from multiple Cherenkov photons produced within a 10 mm-thick quartz radiator plate, to achieve a 15 ps time-of-flight resolution per incident particle. A customised Micro-Channel Plate photomultiplier tube (MCP-PMT) and associated readout system utilises an innovative charge-sharing technique between adjacent pixels to obtain the necessary 70 ps time resolution of each Cherenkov photon. A five-year R&D programme has been undertaken, culminating in the construction of a small-scale prototype TORCH module. In testbeams at CERN, this prototype operated successfully with customised electronics and readout system. A full analysis chain has been developed to reconstruct the data and to calibrate the detector. Results are compared to those using a commercial Planacon MCP-PMT, and single photon resolutions approaching 80 ps have been achieved. The photon counting efficiency was found to be in reasonable agreement with a GEANT4 Monte Carlo simulation of the detector. The small-scale demonstrator is a precursor to a full-scale TORCH module (with a radiator plate of 660×1250×10mm3), which is currently under construction.


The support of the European Research Council is gratefully acknowledged in the funding of this work through an Advanced Grant under the Seventh Framework Programme FP7 (ERC-2011-AdG 299175-TORCH). The authors wish to express their gratitude to Simon Pyatt of the University of Birmingham for wire bonding the NINO ASICs, and the CERN EP-DT-EF and TE-MPE-EM groups for their efforts in the coupling PCB design and bonding. We are grateful to Nigel Hay, Dominic Kent and Chris Slatter of Photek for their work on the MCP-PMT development.



Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2018, 908, pp. 256-268

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/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy


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