Speaker
Dr
Jingbo Wang
(Tsinghua University, Beijing)
Description
The time-of-flight (TOF) system of CBM experiment is proposed to be assembled of multi-gap resistive plate chambers (MRPCs). This system should have a counting rate capability up to 20 kHz/cm2. Usage of low-resistivity glass is a promising way of improving the MRPC rate capability. To address this issue, we produced special silicate glass with bulk resistivity in the order of 10e10Ωcm and tested its long term stability. The thickness of the glass is 0.7mm and its largest dimension is 30cm×30cm. The 50cm×50cm glass will also be produced in about six months. A 10-gap (with 0.25mm gap width) MRPC prototype with silicate glass electrodes was developed for suitability in TOF applications at high rates. Beam tests at GSI have yielded inspiring results: Time resolutions below 85ps and efficiencies larger than 90% were obtained at counting rates up to 20 kHz/cm2. It can be seen that this detector is a good candidate for constructing the high rate CBM-TOF system.
Primary author
Dr
Jingbo Wang
(Tsinghua University, Beijing)
