Performance of a large size triple GEM detector at high particle rate for the CBM Experiment at FAIR
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- 作者：Rama Prasad Adak<sup>asup><sup> ; sup><sup>rpadak@jcbose.ac.insup> ; Ajit Kumar<sup>bsup> ; Anand Kumar Dubey<sup>bsup> ; Subhasis Chattopadhyay<sup>bsup><sup> ; sup><sup>asup> ; Supriya Das<sup>asup> ; Sibaji Raha<sup>asup> ; Subhasis Samanta<sup>asup> ; Jogender Saini<sup>bsup>
- 关键词：Micro-pattern gas detector ; CBM ; Gas electron multiplier ; Triple GEM detector ; MUCH
- 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
- 出版年：2017
- 出版时间：21 February 2017
- 年：2017
- 卷：846
- 期：Complete
- 页码：29-35
- 全文大小：998 K
- 卷排序：846
文摘
In CBM Experiment at FAIR, dimuons will be detected by a Muon Chamber (MUCH) consisting of segmented absorbers of varying widths and tracking chambers sandwiched between the absorber-pairs. In this fixed target heavy-ion collision experiment, operating at highest interaction rate of 10 MHz for Au+Au collision, the inner region of the 1st detector will face a particle rate of 1 MHz/cm2. To operate at such a high particle density, GEM technology based detectors have been selected for the first two stations of MUCH. We have reported earlier the performance of several small-size GEM detector prototypes built at VECC for use in MUCH. In this work, we report on a large GEM prototype tested with proton beam of momentum 2.36 GeV/c at COSY-Jülich Germany. The detector was read out using nXYTER operated in self-triggering mode. An efficiency higher than 96% at ΔVGEM=375.2V was achieved. The variation of efficiency with the rate of incoming protons has been found to vary within 2% when tested up to a maximum rate of 2.8 MHz/cm2. The gain was found to be stable at high particle rate with a maximum variation of ∼9%.