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A Study of Proximity Focusing RICH with Multiple Refractive Index Aerogel Radiator A Study of Proximity Focusing RICH with Multiple Refractive Index Aerogel.

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Presentation on theme: "A Study of Proximity Focusing RICH with Multiple Refractive Index Aerogel Radiator A Study of Proximity Focusing RICH with Multiple Refractive Index Aerogel."— Presentation transcript:

1 A Study of Proximity Focusing RICH with Multiple Refractive Index Aerogel Radiator A Study of Proximity Focusing RICH with Multiple Refractive Index Aerogel Radiator 1 I. Adachi, 2 I. Bertović, 3 K.Fujita, 4 T. Fukushima, 2 A. Gorišek, 3 D. Hayashi, 3 T. Iijima, 3 K.Ikado, 5 M.Iwabuchi, 4 H. Kawai, 6,2 S. Korpar, 3 Y. Kozakai, 7,2 P. Križan, 4 A. Kuratani, 8 T. Matsumoto, 3 Y. Mazuka, 8 T. Nakagawa, 1 S. Nishida, 5 S. Ogawa, 2 R. Pestotnik, 8 T. Seki, 8 T. Sumiyoshi, 4 M. Tabata, 1 Y. Unno 1:IPNS, KEK, Tsukuba, Japan / 2:J.Stefan Institute, Ljubljana, Slovenia / 3:Dept. of Physics, Nagoya Univ., Nagoya, Japan / 4:Dept. of Physics, Chiba Univ., Chiba, Japan /5:Dept. of Physics, Toho Univ., Funabashi, Japan 6:Faculty of Chemistry and Chemical Engineering, Univ. of Maribor, Maribor, Slovenia 7:Faculty of Mathematics and Physics, Univ. of Ljubljana, Ljubljana, Slovenia / 8:Dept. of Physics, Tokyo Metropolitan Univ., Tokyo, Japan presented by Peter Križan Aerogel radiator Position sensitive PD with B=1.5Tesla Cherenkov photon 200mm n=1.05 Proximity Focusing RICH with Aerogel Radiator Developed for a new particle ID device in the Belle forward region improve  /K separation up to 4  at 4 GeV/c limited space operational under 1.5 Tesla magnetic field Key components Hydrophobic aerogel with refractive index of ~1.050 as a Cherenkov radiator Position sensitive photodetector with ~5x5mm 2 pixel size Electronics for read-out Belle detector Performance Test at 2002 Beam Experiment n=1.05 aerogel radiator  =14mrad Npe = 6 4  separation confirmed  4.0GeV “K”4.0GeV typical event RICH prototype counter Hamamatsu Multi-anode Flat-Panel PMT(H8500)  /K 4  separation at 4 GeV/c achieved with a prototype counter  need more photoelectrons for a further improvement as well as for more robustness HOW ? R&D project since 2000 Innovative idea to Get More Photoelectrons w/o Degrading Resolution Simple accumulation of aerogel layers allows to detect more Cherenkov photons, however it deteriorates overall resolution. n1n2 n1


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