Author/Authors :
Aielli، نويسنده , , G. and Alviggi، نويسنده , , M. and Ammosov، نويسنده , , V. and Biglietti، نويسنده , , M. and Camarri، نويسنده , , P. and Canale، نويسنده , , V. and Caprio، نويسنده , , M. and Cardarelli، نويسنده , , R. and Carlino، نويسنده , , G. and Cataldi، نويسنده , , G. and Chiodini، نويسنده , , G. and Conventi، نويسنده , , F. and de Asmundis، نويسنده , , R. and Della Pietra، نويسنده , , M. and Della Volpe، نويسنده , , D. an، نويسنده ,
Abstract :
An ageing test of three ATLAS production RPC stations is in course at X5-GIF, the CERN irradiation facility. The chamber efficiencies are monitored using cosmic rays triggered by a scintillator hodoscope. Higher statistics measurements are made when the X5 muon beam is available. We report here the measurements of the efficiency versus operating voltage at different source intensities, up to a maximum counting rate of about 700 Hz/cm2. We describe the performance of the chambers during the test up to an overall ageing of 4 ATLAS equivalent years corresponding to an integrated charge of 0.12 C/cm2, including a safety factor of 5.
