Author/Authors :
Adachi، نويسنده , , I. and Fujita، نويسنده , , K. and Fukushima، نويسنده , , T. and Gori?ek، نويسنده , , A. and Hayashi، نويسنده , , D. and Iijima، نويسنده , , T. and Ikado، نويسنده , , T. and Ishikawa، نويسنده , , T. and Kawai، نويسنده , , H. and Korpar، نويسنده , , S. and Kozakai، نويسنده , , Y. and Kri?an، نويسنده , , P. and Kuratani، نويسنده , , A. and Mazuka، نويسنده , , Y. and NAKAGAWA، نويسنده , , T. and Nishida، نويسنده , , S. and Ogawa، نويسنده , , S. and Pestotnik، نويسنده , , R. and Seki، نويسنده , , T. and Sumiyoshi، نويسنده , , T. and Tabata، نويسنده , , M. and Unno، نويسنده , , Y.، نويسنده ,
Abstract :
Proximity focusing RICH based on an aerogel Cherenkov radiator has been developed for a new particle identifier in the Belle upgrade. To further improve the detector performance, a new concept for Cherenkov ring imaging has been introduced, where multiple aerogel layers with different indices are accumulated to increase observed photoelectrons without making the single photon resolution worse. By constructing a prototype counter, this idea was validated in a test beam experiment, and we achieved 5.5 σ π / K separation at 4 GeV / c . In addition, the potential of the time-of-flight capabilities to detect time information of Cherenkov photons, where a micro-channel plate PMT is employed as a photodetector, was examined in a beam test, and excellent performance of this technique was obtained.
