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For the Belle II experiment at the superKEKB accelerator, we have been developing a proximity focusing ring imaging Cherenkov counter using silica aerogel as a radiator (ARICH). 144-channel Hybrid Avalanche Photo-Detectors (HAPD) developed with Hamamatsu Photonics K.K. were adopted as the Cherenkov photon detectors for the ARICH. We confirmed that the HAPD has sufficient performance for the ARICH...
A proximity focusing RICH with aerogel radiator has been studied to extend the pion-kaon separation power in the forward region of the Belle spectrometer. Such a proximity focusing RICH counter is also a very fast detector, in particular 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...
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