Physics – Instrumentation and Detectors
Scientific paper
2003-09-04
Nucl.Instrum.Meth. A521 (2004) 367-377
Physics
Instrumentation and Detectors
19 pages, 15 figures. Submitted to Nucl.Instrum.Meth. A
Scientific paper
10.1016/j.nima.2003.11.384
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.
Adachi Ichiro
Fratina S.
Iijima Toru
Ishibashi Rie
Kawai Hajime
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