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Project P8 Photodetectors for High-B Fields Participants: DESY, CERN, JSI, Photonis, UHH; ESR: 3 yrs (contact person: S. Korpar, JSI) Development of photodetectors compatible with high magnetic fields and their application for particle identification and medical imaging. Photodetectors for particle identification in particle physics experiments but also in scintillation detectors for multimodal medical imaging often have to operate in magnetic fields exceeding 1 T. In addition they are required to efficiently detect single photons. While the traditionally used phomultiplier tubes (PMTs) do not work in high magnetic fields, standard semiconductor light sensors (photodiodes, avalanche photo-diodes (APDs)) are not sensitive to single photons. Novel sensors, e.g. multianode micro-channel plates (MCP), silicon photomultipliers (SiPM) and Geiger mode APDs, are currently being evaluated. The aim of this project is to develop and test novel position sensitive single photon detectors for operation in high magnetic fields, and use them in prototype devices. Prototype photon detectors will be tested in collaboration with CERN, Photonis and other network partners. Pulsed light sources will allow scans of the spatial uniformity of response, sensitivity and time resolution. The photon detectors will be installed in two prototype detector set-ups, a proximity focusing ring imaging Cherenkov counter, and a PET apparatus.
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