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Proceedings of 1994 IEEE Nuclear Science Symposium - NSS'94, 1995

Abstract

We have constructed endcap photon detectors with undoped Cesium Iodide (CsI) crystals for a K+→π+νν¯ experiment E787 at Brookhaven National Laboratory (BNL). To reject backgrounds it is essential to have a photon detection system with high efficiency. Good resolution for timing and energy is critical for reducing accidental vetoes. The endcap detectors are located in a magnetic field of 1 T. Fine-mesh photomultiplier tubes are attached directly to the crystals for efficient light collection, and the fast-decay component of CsI light output is selected by optical filters. The tube gains are monitored with the light from a xenon flash lamp and from light pulsers. The pulse shapes are recorded by transient digitizers based on charged coupled devices (CCDs), which enable precise determination of timing of photons. The construction and performance of the detectors are described

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