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Development of ring imaging Cherenkov detectors for the LHCb experiment

  • John, M.J.J.
Publication Date
Jan 01, 2001
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This thesis reports the development of the Ring Imaging CHerenkov (RICH) counters for the LHCb detector. Following a review of the physics goals of LHCb and a description of the detector, it presents results from test beam measurements and describes the development of a simulation of the LHCb RICH. In 1997, 61-pixel hybrid photodiodes (HPDs) were first used in the detection of Cherenkov rings. Details of their signal/noise and stability performance are reported. Measurements of the photon yield and Cherenkov angle precision in a 1/4-scale and full-scale prototype of the LHCb RICH 1 detector using air, aerogel and C_4F_1_0 gas radiators are presented and are compared with simulation. In 1998, a 64-anode multi-anode photomultiplier was used in the detection of Cherenkov rings from an air radiator. The performance of the device is reported and compared with that of an HPD. Studies with the LHCb simulation to evaluate the performance of the LHCb RICH counters in the light of test-beam results is presented. A lens system to increase the geometric efficiency of MaPMTs is described as well as the modifications needed to account for the effect of the lens in the reconstruction of the Cherenkov angle. The detection efficiency, Cherenkov angle resolution and particle-ID performance of a MaPMT system is estimated and compared with the performance predicted for two HPD technology developments. Finally a simulation of particles traversing the photon detectors is described and the effect on the RICH particle identification is reported. (author) / Available from British Library Document Supply Centre-DSC:DXN047943 / BLDSC - British Library Document Supply Centre / SIGLE / GB / United Kingdom

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