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Abstract

eTOF is a forward time of flight (TOF) detector upgrade to the STAR experiment at the rRelativistic Heavy Ion collider (RHIC). The eTOF program is a collabo- ration between STAR and the Compressed Baryonic Matter(CBM) experiment at FAIR. The eTOF wheel consists of 108 CBM-TOF multi-gap resistive plate chamber (MRPC) prototypes. For CBM, eTOF is the first large-scale test of its MRPC prototypes and its free-streaming data acquisition system (DAQ). For STAR, eTOF extends the forward acceptance of its time of flight system for par- ticle identification (PID). These extended PID capabilities are important for the analysis of STAR’s Beam Energy Scan II campaign, especially the in the fixed target program. The MRPC prototypes have shown no significant aging over an operation time of more than two years. An average system time resolution of 70.7 ps with a spread of < 4.3 ps RMS between the individual MRPC time resolutions is achieved. The track matching efficiency of eTOF is close to 70 %. eTOFs PID capabilities are