The Magnetic Distortion Calibration System of the LHCb RICH1 Detector [PDF]
A. Borgia, W. Cameron, A. Contu, C. D'Ambrosio, C. Frei, N. Harnew, M. John, G. Lefeuvre, R. Mountain, S. Stone, D. Websdale, F. XingThe LHCb RICH1 detector uses hybrid photon detectors (HPDs) as its optical sensors. A calibration system has been constructed to provide corrections for distortions that are primarily due to external magnetic fields. We describe here the system design, construction, operation and performance.View original: http://arxiv.org/abs/1206.0253
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