Development of high-rate MRPCs for high resolution time-of-flight systems

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• 作者：Jingbo Wang^a ; ^{jingbo.phy@gmail.com} ; Yi Wang^a ; ^{yiwang@mail.tsinghua.edu.cn} ; D. Gonzalez-Diaz^a ; ^b ; ^c ; Huangshan Chen^a ; Xingming Fan^a ; Yuanjing Li^a ; Jianping Cheng^a ; Marcus Kaspar^d ; Roland Kotte^d ; Alejandro Laso Garcia^d ; Lothar Naumann^d ; Daniel Stach^d ; Christian Wendisch^d ; Jö ; rn Wü ; stenfeld^d
• 关键词：MRPC ; TOF ; CBM ; High rate ; Low-resistive glass ; Rate capability
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2013
• 出版时间：11 June, 2013
• 年：2013
• 卷：713
• 期：Complete
• 页码：40-51
• 全文大小：1986 K

文摘

We show how the high charged-particle flux (1-20 kHz/cm²) expected over the 150 m² large time-of-flight wall of the future Compressed Baryonic Matter experiment (CBM) at FAIR can be realistically handled with Multi-gap Resistive Plate Chambers (MRPCs). This crucial 100-fold increase of the chamber rate capability, as compared to that of standard MRPCs presently employed in experiments resorting to sub-100 ps timing, has been achieved thanks to the development of a new type of low-resistive doped glass. Following the encouraging results previously obtained with small counters, two types of modules (active area: ¡«150 cm²) have been built at Tsinghua University with the new material. The measurements conveyed in this work, obtained with a quasi- minimum ionizing electron beam (¦Ã¦Â¡Ý3), prove their suitability as the building blocks of the present hadron-identification concept of the CBM experiment. Namely, they provide a time resolution better than 80 ps and an efficiency above 90 % at a particle flux well in excess of 20 kHz/cm² (up to 35-60 kHz/cm²), being at the core of a modular concept that is easily scalable. Recent measurements of the electrical and mechanical properties of this new material, together with its long-term behavior, are shortly summarized.