Tests of a proximity focusing RICH with aerogel as radiator
I. Adachi 2, I. Bizjak 3, A. Gorisek 3, T. Iijima 2, M. Iwamoto 1, S. Korpar 3,6, P. Krizan 5,3, R. Pestotnik 3, M. Staric 3, A. Stanovnik 3,4, T. Sumiyoshi 2, K. Suzuki 2 and T. Tabata 1
A study was carried out to measure the performance of a proximity focusing RICH with aerogel as radiator and
multianode PMTs as the detector of Cherenkov photons. The yield and resolution were measured by using a pion test beam. The parameters of the counter were determined for various aerogel materials, densities, thicknesses, angles of incidence, as well as a function of the incoming beam momentum. A light collection system using a single lens per PMT tube was tested as well as a method to increase the active area. Finally, the results were used to study the feasibility of such a counter for the upgrade of the Belle sepctrometer for the high luminosity operation.