Abstract
In order to improve the particle identification capability of the Beijing Spectrometer III (BESIII),t is proposed to upgrade the current endcap time-of-flight (ETOF) detector with multi-gap resistive plate chamber (MRPC) technology. Aiming at extending ETOF overall time resolution better than 100ps, the whole system including MRPC detectors, new-designed Front End Electronics (FEE), CLOCK module, fast control boards and time to digital modules (TDIG), was built up and operated online 3 months under the cosmic ray. The main purposes of cosmic ray test are checking the detectors' construction quality, testing the joint operation of all instruments and guaranteeing the performance of the system. The results imply MRPC time resolution better than 100$ps$, efficiency is about 98$\%$ and the noise rate of strip is lower than 1$Hz/$($scm^{2}$) at normal threshold range, the details are discussed and analyzed specifically in this paper. The test indicates that the whole ETOF system would work well and satisfy the requirements of upgrade.
Highlights
(BC204) readout by fine-mesh photomultiplier tubes (Hamamatsu R5924) [3]
The time resolution measured by endcap time-of-flight (ETOF) detector is 138 ps for π ’s [4,5], which cannot completely satisfy the higher precision requirement of physics
The large numbers of secondary particles from FEE boards and cables between main drift chamber (MDC) and ETOF cause high multi-hits rate in a readout channel of the ETOF made of coarsely segmented scintillator blocks [6]
Summary
The multi-gap resistive plate chamber (MRPC) [7] is a new type of gaseous detector, with excellent time resolution, high detection efficiency, relatively low cost and is insensitivity to neutral particles. The segmentation of the MRPC can be made sufficiently fine to suppress multi-hits events effectively at BESIII as discussed in Ref. In 2012 the proposal [13] was approved to upgrade the current BESIII ETOF with the MRPC technology. We will describe the ETOF upgrade system, including MRPC detectors, the readout electronics, the high voltage system, the gas system, and data acquisition system. The cosmic ray test of the entire ETOF system and relevant analysis results will be discussed
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