Speaker
Description
MRPC has been widely used in many nuclear and particle physics experiments for its good time and efficiency performance. With the increasing of accelerator luminosity, high rate MRPC with large area will be a promising updater in many experiments. Compact Muon Solenoid (CMS) experiment intends to use MRPC technology to upgrade the end-cap muon system. The low-resistive glass developed by Tsinghua University can be used to construct high rate MRPC and the rate capability can excess 25 kHz/cm2. But, there is also a challenge that the size of the glass is limited by the production technology. We initially designed a large mosaic MRPC. 0.5mm-diameter fishing line is used to separate two pieces of glass to prevent sparks. An electric field simulation has been processed, the results show that only 0.1\% of the detector is affected by 0.5mm separator, and this area still has an efficiency high than 80\%. Cosmic ray tests show that the efficiency can reach 94.6\% and the resolution around 74ps. This detector is also tested with 40 MeV electrons beam at Helmholtz-Zentrum Dresden-Rossendorf (HZDR). Similar results have been got. The efficiency is nearly 95\%. The MRPC’s efficiency is still 90\% when the beam intensity reaches around 40 kHz/cm2. The efficiency loss at the joint area is less than 2\%. Based on this technology, a large area trapezoidal MRPC will be constructed for CMS muon system. Analysis results show that muon system with good time resolution can reduce background greatly. presentation type: oral
