Testbeam studies of a TORCH prototype detector

Nicholas Brook, L. Castillo-Garcia, T. M. Conneely, D. Cussans, M. W. U. van Dijk, K. Fohl, R. Forty, C. Frei, R. Gao, T. Gys, T. H. Hancock, N. Harnew, J. Lapingon, J. Milnes, D. Piedigrossi, J. Rademacker, A. Ros Garcia

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

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.
Original languageEnglish
Pages (from-to)256-268
Number of pages13
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume908
Early online date11 Jul 2018
DOIs
Publication statusPublished - 11 Nov 2018

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Photons
prototypes
Readout systems
Detectors
microchannel plates
Photomultipliers
detectors
photons
Radiators
radiators
photomultiplier tubes
readout
modules
Charged particles
arrivals
Quartz
Momentum
counting
charged particles
Electronic equipment

Cite this

Testbeam studies of a TORCH prototype detector. / Brook, Nicholas; Castillo-Garcia, L.; Conneely, T. M.; Cussans, D.; van Dijk, M. W. U.; Fohl, K.; Forty, R.; Frei, C.; Gao, R.; Gys, T.; Hancock, T. H.; Harnew, N.; Lapingon, J.; Milnes, J.; Piedigrossi, D.; Rademacker, J.; Ros Garcia, A.

In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 908, 11.11.2018, p. 256-268.

Research output: Contribution to journalArticle

Brook, N, Castillo-Garcia, L, Conneely, TM, Cussans, D, van Dijk, MWU, Fohl, K, Forty, R, Frei, C, Gao, R, Gys, T, Hancock, TH, Harnew, N, Lapingon, J, Milnes, J, Piedigrossi, D, Rademacker, J & Ros Garcia, A 2018, 'Testbeam studies of a TORCH prototype detector', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 908, pp. 256-268. https://doi.org/10.1016/j.nima.2018.07.023
Brook, Nicholas ; Castillo-Garcia, L. ; Conneely, T. M. ; Cussans, D. ; van Dijk, M. W. U. ; Fohl, K. ; Forty, R. ; Frei, C. ; Gao, R. ; Gys, T. ; Hancock, T. H. ; Harnew, N. ; Lapingon, J. ; Milnes, J. ; Piedigrossi, D. ; Rademacker, J. ; Ros Garcia, A. / Testbeam studies of a TORCH prototype detector. In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2018 ; Vol. 908. pp. 256-268.
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AU - Brook, Nicholas

AU - Castillo-Garcia, L.

AU - Conneely, T. M.

AU - Cussans, D.

AU - van Dijk, M. W. U.

AU - Fohl, K.

AU - Forty, R.

AU - Frei, C.

AU - Gao, R.

AU - Gys, T.

AU - Hancock, T. H.

AU - Harnew, N.

AU - Lapingon, J.

AU - Milnes, J.

AU - Piedigrossi, D.

AU - Rademacker, J.

AU - Ros Garcia, A.

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AB - 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.

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