학술논문
Tests of OPERA RPC detectors
Document Type
Periodical
Author
Bergnoli, A.; Borsato, E.; Brugnera, R.; Buccheri, E.; Candela, A.; Carrara, E.; Ciesielski, R.; Corradi, G.; D'Incecco, M.; Corso, F.D.; Esposti, L.D.; Di Giovanni, A.; Di Marco, N.; Di Troia, C.; Dusini, S.; Fanin, C.; Felici, G.; Gambarara, A.; Garfagnini, A.; Gorin, A.; Grianti, F.; Gustavino, C.; Lindozzi, M.; Longhin, A.; Mastropietro, F.; Mengucci, A.; Monacelli, P.; Paoloni, A.; Paoluzzi, G.; Papalino, G.; Spinetti, M.; Stanco, L.; Stipcevic, M.; Sugonyaev, V.; Tatananni, E.; Terminiello, L.; Terranova, F.; Ventura, M.; Votano, L.; Zauner, B.; Zaytchenko, A.
Source
IEEE Transactions on Nuclear Science IEEE Trans. Nucl. Sci. Nuclear Science, IEEE Transactions on. 52(6):2963-2970 Dec, 2005
Subject
Language
ISSN
0018-9499
1558-1578
1558-1578
Abstract
OPERA is part of the CNGS project and it is an experiment dedicated to the observation of long-baseline /spl nu//sub /spl mu// into /spl nu//sub /spl tau// oscillations through /spl tau/ appearance. Resistive Plate Chambers (RPCs) with bakelite electrodes are used to instrument the 2 cm gaps between the magnetized iron slabs of the two spectrometers. The RPC installation ended in may 2004 on the first spectrometer and in march 2005 on the second one. Before the installation, every RPC is subjected to a complete test chain in order to reject the poorer quality detectors. The tests are performed in dedicated facilities to ensure the proper RPC gluing, to measure its electrical properties and to verify the response to cosmic rays and the intrinsic noise levels. We have also tested the long term stability of real size OPERA RPC prototypes operated at cosmic ray fluxes for more than one year. On small size prototypes we are performing studies on the gas mixtures in order to reduce the total charge released in the gas for each detector count. The validation of the installed RPCs has been performed with pure nitrogen. A small part of them has been also tested with the gas mixture Ar/C/sub 2/H/sub 2/F/sub 4//i-C/sub 4/H/sub 10//SF/sub 6/=75.4/20/4/0.6.