An accurate telescope for beam position monitoring and spatial resolution studies

Abstract A telescope designed for the study of position sensitive detectors has been used for beam position monitoring. The telescope consists of eight silicon strip detectors and it is installed in the RD5 experiment at CERN. The telescope was tested with pion and muon beams in the energy range between 30 and 300 GeV/ c in the North Area of the SPS accelerator. The best impact point errors were 2.5 μm in the vertical and 2.9 μm in the horizontal direction. The signal-to-noise ratios of the detectors were around 40 and the efficiencies above 96%. The alignment of the telescope was very accurate and the correction for possible tilts did not essentially improve the performance.