摘要(英) |
The LEPSII experiment is scheduled to start in 2013. The development of a 4 pi detectors and the construction of a solenoid magnet is currently underway. In order to
separate K and pi with momenta up to 1.5 GeV/c using Time-of-Flight (TOF) over a distance of about 100 cm in the magnet, Multi-Gap Resistive Plate Chamber (MRPC) operated in avalanche mode is chosen due to the need of large area, high e ciency and 50-ps time resolution. For optimizing the best con guration of MRPC, we investigated geometry of pad/strip, width of gap, number of gap, the gas mixture, trigger rate, etc. The 260um x 2 stacks x 5 gaps MRPC with the 2.5 x 100 cm2 strip reached 99 % effi ciency and around 60-ps time resolution below 20 Hz/cm2. The chamber was filled with gas mixture of 90 % R134a, 5 % SF6 and 5 % Iso-butane. The signals were ampli ed by PMT Amp (KN2104). We needs around 400 channels to cover the whole area of TOF system. The performance of MRPC is close to LEPSII requirement. The gas mixture and the ampli er will be investigated in the future.
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