A low resistivity RPC for the trigger of the ALICE di-muon arm

Resistive Plate Chambers (RPC) operated in streamer mode are expected to provide the trigger of the ALICE dimuon forward spectrometer. To match the requirements concerning the rate capability (about 100 Hz/cm2, including a large safety factor), several prototypes have been realized with low-resistiv...

Descripción completa

Detalles Bibliográficos
Autores principales: Ferretti, A, Arnaldi, R, Baldit, A, Barret, V, Bastid, N, Blanchard, G, Chiavassa, E, Cortese, P, Crochet, Philippe, Dellacasa, G, De Marco, N, Drancourt, C, Dupieux, P, Espagnon, B, Forestier, B, Gallio, M, Genoux-Lubain, A, Insa, C, Jouve, F, Lamoine, L, Lefèvre, F, Manso, F, Mereu, P, Musso, A, Oppedisano, C, Piccotti, A, Rosnet, P, Royer, L, Saturnini, P, Scalas, E, Scomparin, E, Sigaudo, F, Vercellin, Ermanno
Lenguaje:eng
Publicado: 2001
Materias:
Detectors and Experimental Techniques
Acceso en línea:https://dx.doi.org/10.22323/1.007.0267
http://cds.cern.ch/record/524752
Descripción
Sumario:Resistive Plate Chambers (RPC) operated in streamer mode are expected to provide the trigger of the ALICE dimuon forward spectrometer. To match the requirements concerning the rate capability (about 100 Hz/cm2, including a large safety factor), several prototypes have been realized with low-resistivity Bakelite electrodes and a strongly quenching gas mixture. Duringb eam and irradiation tests the detector has shown a stable behaviour and excellent rate capability (up to 1 kHz/cm 2 in eam tests) with a cluster size close to one. In addition to that,a new discrimination technique with a dual threshold has been devised: with this method, a time resolution comparable with the one typical of the avalanche mode can be obtained as soon as the applied voltage is sufficient for the RPC to reach full efficiency. In the presentation the performances of the detector will be reported, together with the results of ageing tests performed at the Gamma Irradiation Facility at CERN.

Ejemplares similares