Abstract
The trigger system of the Alice dimuon spectrometer is based on RPC detectors. We present experimental results of a beam test about rate capability, time resolution and cluster size of single gap RPC detectors operating both in ‘streamer mode’ and in ‘avalanche mode’. We have compared the performances of small chambers (50×50 cm 2) built with bakelite of different resistivity, from ∼ 3 · 10 9 Ωcm to ∼ 3 · 10 11 Ωcm. For the low resistivity RPC we obtained a rate capability of several hundreds of Hz/cm 2 when it is operating in ‘streamer mode’, and of several thousands of Hz/cm 2 when it is operating in ‘avalanche mode’.
Highlights
The ALICE experiment will study nucleusnucleus interactions at the LHC in order to investigate nuclear matter at extreme energy density where the formation of the Quark-Gluon-Plasma QGP is expected
A study of RPC with surface of 50x50 cm[2] and with bakelite electrodes of di erent resistivity was performed at the SPS in order to de ne the parameters of the chambers which will be used in the Alice dimuon trigger
Cluster size and time resolution were measured for the RPCs operating in streamer mode and in avalanche mode
Summary
The ALICE experiment will study nucleusnucleus interactions at the LHC in order to investigate nuclear matter at extreme energy density where the formation of the Quark-Gluon-Plasma QGP is expected. The trigger detectors of the ALICE muon spectromer will be Resistive Plate Chambers RPC 3,4 which are simple devices well suited to trigger purposes: fast response and good time resolution; futhermore they are industrially produced and suitable to cover large areas. For these reasons the RPC are in use in various experiments and they will be largely used at the LHC experiments for the muon trigger. RPC tests on beam have been performed in order to optimize the detector's performances for the ALICE experimental conditions
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