Author/Authors :
Schüttauf، نويسنده , , A. and Ciobanu، نويسنده , , M. and Hildenbrand، نويسنده , , K.D. and Ki?، نويسنده , , M. and Deppner، نويسنده , , I. and Herrmann، نويسنده , , N. and Kim، نويسنده , , Y.J. and KANG، نويسنده , , T.I. and Koczon، نويسنده , , P. and Lopez، نويسنده , , X. and Leifels، نويسنده , , Y. and Petrovici، نويسنده , , M. and Piasecki، نويسنده , , K. and Reischl، نويسنده , , A. and Reisdorf، نويسنده , , W. S. Ryu، نويسنده , , M.S. and Simion، نويسنده , , V. and Zernezki، نويسنده , , N. and Zhang، نويسنده , , X.، نويسنده ,
Abstract :
During the last years FOPI has developed a new ToF system as an upgrade of the existing detector based on Multi-strip Multi-gap Resistive Plate Chambers (MMRPCs). The intention is to increase the charged Kaon identification up to a laboratory momentum of 1 GeV / c and to enhance the azimuthal detector granularity. The new ToF barrel has an active area of 5 m 2 with 2400 individual strips ( 900 × 1.6 mm 2 ) [A. Schüttauf, et al., Nucl. Phys. B 158 (2006) 52] which are read out on both sides by a custom designed electronics [M. Ciobanu, et al., IEEE Trans. Nucl. Sci. NS-54 (4) (2007) 1201; K. Koch, et al., IEEE Trans. Nucl. Sci. NS-52(3) (2005) 745]. To reach the envisaged goal a time resolution of 100 ps is needed, at a flight path of 1–1.3 m. Due to the rare production of the K − at SIS energies the efficiency of the MMRPCs has to be above 95%. We report on measurements with the detectors and electronics from the mass production line. For this purpose we used a proton beam at 2.0 and 1.25 GeV, at rates between 0.1 and 5 kHz / cm 2 to determine the timing, efficiency and rate capability of the MMRPCs.
Keywords :
Timing RPCs , Segmented-anode MRPC , Time resolution , MMRPCs , efficiency , Rate effects , Front-End-Electronics , FOPI
