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Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/4127

Title: The response to high magnetic fields of the vacuum phototriodes for the compact muon solenoid endcap electromagnetic calorimeter
Authors: Bell, KW
Brown, RM
Cockerill, DJA
Flower, PS
Hobson, PR
Imrie, DC
Kennedy, BW
Lintern, AL
Sharif, O
Sproston, M
Williams, JH
Keywords: Vacuum photodetector
VPT
Phototriode
CMS
Calorimeter
Publication Date: 2003
Publisher: Elsevier
Citation: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 504(1-3): 255-257
Abstract: The endcap electromagnetic calorimeter of the Compact Muon Solenoid (CMS) detects particles with the dense fast scintillator lead tungstate (PbWO4). Due to the low light yield of this scintillator photodetectors with internal gain are required. Silicon avalanche photodiodes cannot be used in the endcap region due to the intense neutron flux. Following an extensive R&D programme 26 mm diameter single-stage photomultipliers (vacuum phototriodes) have been chosen as the photodetector in the endcap region. The first 1400 production devices are currently being evaluated following recent tests of a pre-production batch of 500 tubes. Tubes passing our acceptance tests have responses, averaged over the angular acceptance of the endcap calorimeter, corresponding to the range 20 to 55 electrons per MeV deposited in PbWO4. These phototriodes operate, with a typical gain of 10, in magnetic fields up to 4T.
Sponsorship: PPARC, EC(INTAS-CERN scheme 99-424)
URI: http://bura.brunel.ac.uk/handle/2438/4127
DOI: http://dx.doi.org/doi:10.1016/S0168-9002(03)00802-7
ISSN: 0168-9002
Appears in Collections:School of Engineering and Design Research papers
Electronic and Computer Engineering

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