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CsI endcap photon detector for aK⁺→π⁺νν¯ experiment at BNL
Chiang, I.-H. Garber, E. Inagaki, T. Ino, K. Kabe, S. Kettell, S. Kobayashi, M. Komatsubara, T.K. Kuno, Y. Li, K.K. Littenberg, L.S. Morimoto, T. Nakano, T. Omata, K. Sato, T. Shinkawa, T. Sugimoto, S. Tauchi, K. Yamashita, A. Yoshimura, Y.
Brookhaven Nat. Lab., Upton, NY;

This paper appears in: Nuclear Science, IEEE Transactions on
Publication Date: Aug 1995
Volume: 42, Issue: 4, Part 1-2
On page(s): 394-400
Meeting Date: 10/30/1994 - 11/05/1994
Location: Norfolk, VA, USA
ISSN: 0018-9499
References Cited: 12
CODEN: IETNAE
INSPEC Accession Number: 5047003
Digital Object Identifier: 10.1109/23.467813
Current Version Published: 2002-08-06

Abstract
We have constructed an endcap photon detector with undoped cesium iodide (CsI) crystals for 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 in a high-counting-rate environment. The endcap detector is located in a 1 T magnetic field. Fine-mesh photomultiplier tubes are attached directly to the crystals for efficient light collection, and the fast-decay component of the 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 enables precise determination of timing of endcap signals. The construction and performance of the detector are described

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