An ageing test of three ATLAS production RPC stations is in progress at X5 GIF, the CERN irradiation facility. The chamber efficiency as a function of the operating voltage is measured at different source intensities, tip to a maximum counting rate of about 700 Hz/cm(2). All along the test., plate resistivity has been monitored using two different methods: by measuring the I-V characteristics in pure Ar, and by comparing the efficiency vs high voltage curves at different source intensities. The increase in plate resistivity, which is one of the dominant ageing effects for RPCs with phenolic-melaminic electrodes, has been shown to be strongly dependent on environmental relative humidity. Indeed, after setting to values between 40% and 50% the relative humidity of both the operating gas and the air surrounding the chambers, a significant decrease of the plate resistivity has been observed.

Aielli, G., Alviggi, M., Ammosov, V., Bianco, M., Biglietti, M., Camarri, P., et al. (2004). Ageing test of ATLAS RPCs at CERN's gamma irradiation facility. In IEEE Symposium Conference Record Nuclear Science 2004 (pp.226-230). IEEE [10.1109/NSSMIC.2004.1462186].

Ageing test of ATLAS RPCs at CERN's gamma irradiation facility

AIELLI, GIULIO;CAMARRI, PAOLO;DI CIACCIO, ANNA;
2004

Abstract

An ageing test of three ATLAS production RPC stations is in progress at X5 GIF, the CERN irradiation facility. The chamber efficiency as a function of the operating voltage is measured at different source intensities, tip to a maximum counting rate of about 700 Hz/cm(2). All along the test., plate resistivity has been monitored using two different methods: by measuring the I-V characteristics in pure Ar, and by comparing the efficiency vs high voltage curves at different source intensities. The increase in plate resistivity, which is one of the dominant ageing effects for RPCs with phenolic-melaminic electrodes, has been shown to be strongly dependent on environmental relative humidity. Indeed, after setting to values between 40% and 50% the relative humidity of both the operating gas and the air surrounding the chambers, a significant decrease of the plate resistivity has been observed.
IEEE Nuclear Science Symposium and Medical Imaging Conference
Rome, ITALY
OCT 16-22, 2004
IEEE Commun Soc, Nucl & Plasma Sci Soc
Rilevanza internazionale
contributo
Settore FIS/01 - Fisica Sperimentale
English
Intervento a convegno
Aielli, G., Alviggi, M., Ammosov, V., Bianco, M., Biglietti, M., Camarri, P., et al. (2004). Ageing test of ATLAS RPCs at CERN's gamma irradiation facility. In IEEE Symposium Conference Record Nuclear Science 2004 (pp.226-230). IEEE [10.1109/NSSMIC.2004.1462186].
Aielli, G; Alviggi, M; Ammosov, V; Bianco, M; Biglietti, M; Camarri, P; Canale, V; Caprio, M; Cardarelli, R; Carlino, G; Chiodini, G; Conventi, E; de Asmundis, R; Della Pietra, M; Della Volpe, D; DI CIACCIO, A; Di Simone, A; Gorini, E; Grancagnolo, F; Iengo, P; Liberti, B; Nisati, A; Pastore, F; Patricelli, S; Perrino, R; Primavera, M; Santonico, R; Sekhniaidze, G; Solfaroli, E; Spagnolo, S; Sviridov, Y; Vari, R; Veneziano, S; Zaets, V
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/168202
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