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arXiv physics/03020292003-02-11physics.ins-det

First results from an aging test of a prototype RPC for the LHCb Muon System

Andrea Bizzeti, Giovanni Carboni, Gianmaria Collazuol, Stefano De Capua, Danilo Domenici, Gerardo Ganis, Roberto Messi, Giovanni Passaleva, Emanuele Santovetti, Michele Veltri

备注：: 6 pages, 9 figures, presented at the International Workshop on Aging Phenomena in Gaseous Detectors'', DESY-Hamburg (Germany), October 2001
发表信息：: Nucl.Instrum.Meth. A515 (2003) 348-353
DOI：: 10.1016/j.nima.2003.09.022

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Recent results of an aging test performed at the CERN Gamma Irradiation Facility on a single--gap RPC prototype developed for the LHCb Muon System are presented. The results are based on an accumulated charge of about 0.45 C/cm$^2$, corresponding to about 4 years of LHCb running at the highest background rate. The performance of the chamber has been studied under several photon flux values exploiting a muon beam. A degradation of the rate capability above 1 kHz/cm$^2$ is observed, which can be correlated to a sizeable increase of resistivity of the chamber plates. An increase of the chamber dark current is also observed. The chamber performance is found to fulfill the LHCb operation requirements.

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