A proximity focusing ring imaging Cherenkov detector using aerogel as the radiator has been studied for an upgrade of the Belle detector at the KEK-B-factory. We constructed a prototype Cherenkov counter using a 4 x 4 array of 64-channel flat-panel multi-anode PMTs (Hamamatsu H8500) with a large effective area. The aerogel samples were made with a new technique to obtain a higher transmission length at a high refractive index (n=1.05). Multi-channel PMTs are read-out with analog memory chips. The detector was tested at the KEK-PS pi2 beam line in November, 2002. To evaluate systematically the performance of the detector, tests were carried out with various aerogel samples using pion beams with momenta between 0.5 GeV/c and 4 GeV/c. The typical angular resolution was around 14 mrad, and the average number of detected photoelectrons was around 6. We expect that pions and kaons can be separated at a 4 sigma level at 4 GeV/c.
@article{arxiv.physics/0309032,
title = {Studies of Proximity Focusing RICH with an aerogel radiator using Flat-panel multi-anode PMTs (Hamamatsu H8500)},
author = {T. Matsumoto and S. Korpar and I. Adachi and S. Fratina and T. Iijima and R. Ishibashi and H. Kawai and P. Krizan and S. Ogawa and R. Pestotnik and S. Saitoh and T. Seki and T. Sumiyoshi and K. Suzuki and T. Tabata and Y. Uchida and Y. Unno},
journal= {arXiv preprint arXiv:physics/0309032},
year = {2009}
}
Comments
19 pages, 15 figures. Submitted to Nucl.Instrum.Meth. A