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Performance of the LHCb RICH photodetectors in a charged particle beam

Authors
Journal
Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment
0168-9002
Publisher
Elsevier
Volume
574
Issue
1
Identifiers
DOI: 10.1016/j.nima.2007.01.100
Keywords
  • Ring Imaging Cherenkov Detectors
  • Hybrid Photon Detectors
  • Lhcb Experiment

Abstract

Abstract The Ring Imaging Cherenkov detectors of LHCb will use pixel Hybrid Photon Detectors to measure the spatial position of Cherenkov photons. The first six pre-production photon detectors have been tested in a beam, together with prototypes of the on-detector electronics. The tests were performed at CERN using 10 GeV / c pions together with an N 2 gas radiator as a source of Cherenkov light. With 1.1 m of radiator, around 10 photoelectrons were detected per track. The single-photon Cherenkov angle resolution was measured to be 1.66 ± 0.03 mrad , which is dominated by the pixelisation of the photon detector in the test-beam set-up. Both numbers agree with expectations.

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