Multi-gap RPC prototypes with readout on a multi-strip electrode weredeveloped for the small polar angle region of the CBM-TOF subdetector, the mostdemanding zone in terms of granularity and counting rate. The prototypes arebased on low resistivity ($\sim$10$^{10}$ $\Omega$cm) glass electrodes forperforming in high counting rate environment. The strip width/pitch size waschosen such to fulfill the impedance matching with the front-end electronicsand the granularity requirements of the innermost zone of the CBM-TOF wall. Thein-beam tests using secondary particles produced in heavy ion collisions on aPb target at SIS18 - GSI Darmstadt and SPS - CERN were focused on theperformance of the prototype in conditions similar to the ones expected atSIS100/FAIR. An efficiency larger than 98\% and a system time resolution in theorder of 70~-~80~ps were obtained in high counting rate and high multiplicityenvironment.
展开▼
