Author/Authors :
Barnyakov، نويسنده , , A.Yu. and Barnyakov، نويسنده , , M.Yu. and Bobrovnikov، نويسنده , , V.S. and Buzykaev، نويسنده , , A.R. and Danilyuk، نويسنده , , A.F. and Kononov، نويسنده , , S.A. and Kravchenko، نويسنده , , E.A. and Minakov، نويسنده , , G.D and Onuchin، نويسنده , , A.P. and Rodiakin، نويسنده , , V.A. and Savinov، نويسنده , , G.A and Tayursky، نويسنده , , V.A.، نويسنده ,
Abstract :
Cherenkov counters based on Aerogel, wavelength SHIfter, and PHotomultipliers (ASHIPH) for the KEDR detector are described. As compared with the direct light collection on PMT, the ASHIPH method allows us to diminish the number of PMTs essentially. The quality of the particle identification with the ASHIPH counters was tested. The π/K separation is 4.5σ for the momentum 1.2 GeV/c. The mass production of the ASHIPH counters was organized in Budker Institute of Nuclear Physics (Novosibirsk, Russia). 80 counters filled with 500 ls of aerogel have been produced and tested with cosmic muons. These counters were installed into the KEDR detector in 2003. The stability of the micro-channel PMTs without protecting layer was studied. The first results on a long-term stability of the ASHIPH counters filled with the hygroscopic aerogel are presented.
