Studies of proximity focusing RICH with an aerogel radiator using flat-panel multi-anode PMTs (Hamamatsu H8500)
/ Authors
T. Matsumoto, S. Korpar, I. Adachi, S. Fratina, T. Iijima, R. Ishibashi, H. Kawai, P. Križan, S. Ogawa, R. Pestotnik
and 14 more authors
S. Saitoh, T. Seki, T. Sumiyoshi, K. Suzuki, T. Tabata, Y. Uchida, Y. university, J. S. Institute, Ljubljana, Kek, Tsukuba, N. University, C. University, T. University
/ Abstract
Abstract A proximity focusing ring imaging Cherenkov detector using aerogel as the radiator has been studied for upgrading the Belle detector at the KEK-B-factory. We constructed a prototype Cherenkov counter using a 4×4 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 π 2 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 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 σ level at 4 GeV /c .
Journal: Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment