Abstract
A proximity focusing RICH with aerogel radiator has been studied to extend the hadron identification capabilities in the forward region of the Belle spectrometer. Such a proximity focusing RICH counter is also a very fast detector if a micro-channel plate (MCP) PMT is used as the photon detector. With its excellent timing properties, the same device could also serve as a time-of-flight counter and thus supplement other identification methods. A prototype of this novel device using BURLE 85011 64-anode, microchannel plate PMT, was tested on the bench and in the test beam at KEK. A good separation of pions and protons was observed in the test beam data with a time-of-flight resolution of about 35 ps (rms) for Cherenkov photons produced in the PMT window.
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