Abstract
The Compressed Baryonic Matter (CBM) experiment will be one of the major scientific pillars of the future Facility for Antiproton and Ion Research (FAIR) in Darmstadt. The Multigap Resistive Plate Chamber (MRPC) has been adopted for the construction of the Time of Flight (TOF) Wall; a system time resolution of 80ps is necessary for hadron identification. MRPC3b, as defined in the CBM TOF TDR, has been designed for the outer region of the TOF system. The MRPC3b is a two-stack, 10 gas gaps with 32 strips read out at both ends. The thin floating glass will be used as the electrodes. In this paper, the design details will be discussed. The mass production has already during the spring of 2017. The assembly procedures and QA (Quality Assurance) & QC (Quality Control) methods will also be presented. The performance achieved from the cosmic ray test shows that the efficiency is better than 91% and the resolution is about 80ps with 95% Freon and 5% iso-butane gas mixture.
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