Author/Authors :
Ki?، نويسنده , , M. and Ciobanu، نويسنده , , M. and Deppner، نويسنده , , I. and Hildenbrand، نويسنده , , K.D. and Herrmann، نويسنده , , N. and Kang، نويسنده , , T.I. and Kim، نويسنده , , Y.J. and Koczon، نويسنده , , P. and Leifels، نويسنده , , Y. and Marquardt، نويسنده , , M. and Petrovici، نويسنده , , M. and Piasecki، نويسنده , , K. and Ryu، نويسنده , , M.S. and Schüttauf، نويسنده , , A. and Simion، نويسنده , , V. and Weinert، نويسنده , , J. ، نويسنده ,
Abstract :
The FOPI detector [1] at the heavy-ion synchrotron SIS-18 at GSI in Darmstadt has upgraded part of its time-of-flight (ToF) system by adding a new sub-detector shell (called the MMRPC Barrel) that is made out of Multi-strip Multi-gap Resistive-Plate Counters (MMRPCs). The MMRPC Barrel has an active area of 5 m2 covered by 2400 individual anode strips [2,3] which are read out at both ends by custom-designed electronics [4,5]. With these multi-strip anodes we have obtained an enhanced detector granularity with 95% efficiency and a ToF resolution σ ToF better than 90 ps which increases the identification limit for charged kaons up to laboratory momenta of at least 1 GeV/c. In this paper we report on the design, construction and operational characteristics of the MMRPC Barrel and describe its performance during the first experiments.
Keywords :
FOPI , MMRPC , Timing RPC , TOF , Multi-strip , Segmented anode
