New results from an extensive aging test on bakelite Resistive Plate Chambers
Giovanni Carboni, Gianmaria Collazuol, Stefano De Capua, Danilo Domenici, Gerardo Ganis, Roberto Messi, Giovanni Passaleva, Emanuele Santovetti, Michele Veltri
Abstract
We present recent results of an extensive aging test, performed at the CERN Gamma Irradiation Facility on two single--gap RPC prototypes, developed for the LHCb Muon System. With a method based on a model describing the behaviour of an RPC under high particle flux conditions, we have periodically measured the electrode resistance R of the two RPC prototypes over three years: we observe a large spontaneous increase of R with time, from the initial value of about 2 MOhm to more than 250 MOhm. A corresponding degradation of the RPC rate capabilities, from more than 3 kHz/cm2 to less than 0.15 kHz/cm2 is also found.
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