Performance tests of the MSMGRPCs using a free-streaming readout

Abstract

Result of the R&D activity for the development of a Multi-Gap Resistive Plate Chamber with Multi-Strip readout architecture (MSMGRPC), for high counting rate and multiplicity environment, specific for high interaction rate experiments, are reported. The free streaming readout concept considered for the CBM experiment at future FAIR facility in Darmstadt, Germany, requires MSMGRPCs with a very good matching of the signal transmission line impedance to the front-end electronics input impedance such that fake signals resulted from reflexions to be neglijible. Two prototypes based on low resistivity glass (∼10 10 Ωcm) with the impedance of the signal transmission line matched to the input impedance of the front-end electronics were constructed. The granularity requirement for the inner zone of the CBM-TOF wall is fulfilled by a proper choice of the strip lenght. The prototypes were tested in-beam at CERN-SPS with reaction products produced by colliding Pb beam of momenta of 1 ·A GeV, 30·A GeV and 150·A GeV on a Pb target. The performance obtained using a free-streaming readout is reported.

The CBM Time-of-Flight system

“…Here MRPCs with granularities between 6 and 20 cm 2 are foreseen. The MRPC1 prototype developed in Bucharest (described in [10,11]) is equipped with low resistivity glass (ρ = 3 × 10 10 Ω/cm) of 0.7 mm thickness and has a granularity of about 6 cm 2 . Figure 2 depicts the structure and a photograph of the MRPC1 prototype called DSMRPC2015.…”