Studies of a proximity focusing aerogel RICH for the Belle upgrade

Author

S. Nishida;I. Adachi;S. Fratina;T. Fukushima;A. Gorisek;T. Iijima;H. Kawai;M. Konishi;S. Korpar;Y. Kozakai;P. Krizan;T. Matsumoto;S. Ogawa;S. Ohtake;R. Pestotnik;S. Saitoh;T. Seki;T. Sumiyoshi;Y. Uchida;Y. Unno;S. Yamamoto

Author_Institution

High Energy Accel. Res. Organ., KEK, Tsukuba, Japan

Volume

3

fYear

2004

fDate

6/26/1905 12:00:00 AM

Firstpage

1951

Abstract

For future upgrade of the Belle detector at the KEK B-factory we are developing a proximity focusing ring imaging Cherenkov detector using aerogel as a radiator. We present results from recent beam tests using 4times4 array of the flat-panel multi-anode PMTs. We introduce a new design, so called "dual radiator" scheme to improve the performance. In this design, we image Cherenkov photons from two aerogel radiators with different refractive indices. The results of the beam tests show that the photoelectron yield can be increased without significant deterioration in the angular resolution, leading to 4.8sigma K/pi separation at 4 GeV/c. We also discuss multi-radiator RICH, which consists of more than two radiators.

Keywords

"Detectors","Testing","Focusing","Counting circuits","Optical refraction","Refractive index","Uncertainty","Tagging","Position measurement","Goniometers"

Publisher

ieee

Conference_Titel

Nuclear Science Symposium Conference Record, 2004 IEEE

ISSN

1082-3654

Print_ISBN

0-7803-8700-7

Type

conf

DOI

10.1109/NSSMIC.2004.1462628

Filename

1462628