Trigger rate dependence and gas mixture of MRPC for the LEPS2 experiment at SPring-8

Hsieh Chia-Yu, Natsuki Tomida, Hiroaki Ohnishi, Masayuki Niiyama, Chang Wen-Chen, Lin Willis Tsung-Tai

Research output: Contribution to journalConference articlepeer-review


In order to separate K and π with momenta up to 1.1 GeV/c using Time-of-Flight (TOF) over a distance of about 100 cm in the magnet, we will use Multi-Gap Resistive Plate Chamber (MRPC) due to the need of large area, high efficiency and overall time resolution in the range of 50-100 ps. We built a 260 μm × 10 gaps MRPC with an active area of 10 × 50 cm2 and a pad size of 2.5 × 40 cm2. We studied the trigger rate dependence and the gas mixture of this MRPC. It was found that high enough voltage is necessary to achieve a good time resolution and high efficiency at large trigger rates. The gas mixture composed of R134a : SF6 : Iso-Butane at 90% : 5% : 5% is our optimized choice.

Original languageEnglish
Article number061
JournalProceedings of Science
Publication statusPublished - 2012
Externally publishedYes
Event11th Workshop on Resistive Plate Chambers and Related Detectors, RPC 2012 - Rome, Italy
Duration: 2012 Feb 52012 Feb 10

ASJC Scopus subject areas

  • General


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