Progress of R&amp;D and production of timing RPCs in Tsinghua University

“…The MRPC is suitably operated in avalanche mode with a gas mixture of Freon (C 2 H 2 F 4 , also named R-134a), iso-butane (i-C 4 H 10 ) and SF 6 . It has been shown by many groups that a 90/5/5 proportion gas mixture provides the best working condition for the MRPC [8][9][10]. C 2 H 2 F 4 is a kind of electronegative gas.…”

Section: Gas Pollutionmentioning

confidence: 99%

Gas related effects on multi-gap RPC performance in high luminosity experiments

et al. 2016

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The Multi-gap Resistive Plate Chamber (MRPC) is a new type of gas detector developed in recent years. It has excellent time resolution (better than 100 ps) and high efficiency (higher than 95%). This detector has been used to construct large-area time-of-flight (TOF) system in many nuclear and particle physics experiments. However, as a type of gaseous detector, the aging of the gas mixture under long-time exposure to ionizing radiation cannot be neglected. With the increase of accelerator luminosity, impurities in the gas mixture can be potentially dangerous for long-term operation of the MRPC. This has been observed in some experiments, for example with the RHIC-STAR muon telescope detector. The CBM-TOF, used for hadron identification, is proposed to be assembled with MRPCs. These counters have to stand particle fluxes as high as 25 kHz/cm 2 , and thus the gas pollution is a critical aspect to be studied.In order to better understand the gas quality's impact on the MRPC performance, a twodimensional simulation based on the SIMPLE algorithm is carried out to imitate the distribution of impurities in a MRPC gas box. The preliminary results show that gas pollution grows stronger with the increase of the gas-flowing volume. In addition, we conducted a series of experiments with a 50 × 50 cm 2 , 8-gap MRPC prototype. The results match the simulation quite well. Gas pollution indeed has a severe impact on the MRPC performance, and further study can be very useful to reduce gas aging effects in high-luminosity experiments. K: Instrumentation and methods for time-of-flight (TOF) spectroscopy; Resistive-plate chambers; Timing detectors 1Corresponding author.

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“…The experiment was done with the high rate pad MRPC [3]. It was assembled with low resistivity glass.…”

Section: Experimental Setup and Data Takingmentioning

confidence: 99%

Aging test of high rate MRPC

Wang¹,

Fan²,

Chen³

et al. 2012

Proceedings of XI Workshop on Resistive Plate Chambers and Related Detectors — PoS(RPC2012)

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A new kind of low resistivity glass has been developed. Its volume resistivity is on the order of 10 10 Ωcm and MRPCs assembled with it show a very promising rate capability (>25 kHz/cm 2). This new detector has a very important range of application in high energy physics experiments such as FAIR-CBM, LHC-ATLAS or Jlab-SOLID, to mention some. In this paper we report new results related to its long-term behavior (ageing). The module has been irradiated by X-rays at a mips-equivalent flux of 15kHz/cm 2 , for 300 hours and for a released charge totaling 0.22C. No noticeable degradation could be observed. Compared to common glass MRPCs, the newly developed high rate counter responds faster to sudden irradiation.

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Progress of R&D and production of timing RPCs in Tsinghua University

Cited by 8 publications

References 3 publications

Performance study of new style mosaic MRPC

Performance study of new style mosaic MRPC

Gas related effects on multi-gap RPC performance in high luminosity experiments

Aging test of high rate MRPC

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