Author/Authors :
Korpar، نويسنده , , S. and 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 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 :
A proximity focusing ring imaging Cherenkov detector, with the radiator consisting of two or more aerogel layers of different refractive indices, has been tested in 1 – 4 GeV / c pion beams at KEK. Essentially, a multiple refractive index aerogel radiator allows for an increase in Cherenkov photon yield on account of the increase in overall radiator thickness, while avoiding the simultaneous degradation in single photon angular resolution associated with the increased uncertainty of the emission point. With the refractive index of consecutive layers suitably increasing in the downstream direction, one may achieve overlapping of the Cherenkov rings from a single charged particle. The impact of the observed improvement on the π / K separation at the upgraded Belle detector is discussed.
Keywords :
Ring imaging Cherenkov counter , Proximity focusing , Particle identification , Belle , aerogel
