Gaseous tracking chambers based on the Gas Electron Multiplier (GEM) technology will be used for the first two stations of the Muon Chamber system of the Compressed Baryonic Matter (CBM) experiment at FAIR . Large size trapezoidal modules each having 2D pad-readout with ~2.2k pads were designed and fabricated for data taking in the mCBM (mini-CBM) experiment set-up at the SIS18 facility of GSI as a part of the FAIR Phase-0 program. In this contribution, we report on the testing of two such GEM modules within nucleus + nucleus collisions at 1 - 2A GeV beam energies in the mCBM experiment. Data with the first version of a self-triggered readout ASIC has been used for the first time. The response of the GEM modules in terms of spill structure, cluster-size characteristics, time correlation between detector sub-systems, among others, have been studied. Preliminary results obtained during the mCBM data campaign in March 2019, displaying the detector chara...

中文翻译：

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在GSI的SIS18设施的mCBM实验中为CBM Muon Chamber系统测试了三个GEM原型

FAIR的压缩重子物质（CBM）实验的Muon腔系统的前两个站将使用基于气体电子倍增器（GEM）技术的气体跟踪腔。设计并制造了每个都具有约2.2k焊盘的2D焊盘读数的大型梯形模块，用于将数据采集到GSI的SIS18工厂进行的mCBM（微型CBM）实验设置中，作为FAIR Phase-0计划的一部分。在这项贡献中，我们报告了在mCBM实验中以1-2A GeV束能量在核+核碰撞中测试两个此类GEM模块的过程。第一次使用具有自触发读出ASIC的第一个版本的数据。研究了GEM模块在溢出结构，簇大小特征，检测器子系统之间的时间相关性等方面的响应。