Author/Authors :
Matsumoto، نويسنده , , T and Korpar، نويسنده , , S and Adachi، نويسنده , , I and Fratina، نويسنده , , S and Iijima، نويسنده , , T and Ishibashi، نويسنده , , R and Kawai، نويسنده , , H and Kri?an، نويسنده , , P and Ogawa، نويسنده , , S and Pestotnik، نويسنده , , R and Saitoh، نويسنده , , S and Seki، نويسنده , , T and Sumiyoshi، نويسنده , , T and Suzuki، نويسنده , , K and Tabata، نويسنده , , T and Uchida، نويسنده , , Y and Unno، نويسنده , , Y، نويسنده ,
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 π2 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 4σ level at 4 GeV/c.
Keywords :
aerogel , Flat-panel PMT , Ring imaging Cherenkov counter , Proximity focusing , Particle identification , Belle
