arXiv 1604.028992016-04physics.ins-det

FAIR上CBM实验用大尺寸三重GEM探测器在高粒子率下的性能

Performance of a large size triple GEM detector at high particle rate for CBM Experiment at FAIR

Rama Prasad Adak, Ajit Kumar, A. K. Dubey, Subhasis Samanta, J. Saini, S. Das, S. Raha, Subhasis Chattopadhyay

备注：: 7 pages, 16 figures

摘要：

在FAIR的CBM实验中，双μ子将由μ子室（MUCH）检测，该μ子室由不同宽度的分段吸收体和夹在吸收体对之间的跟踪室组成。在该固定靶重离子碰撞实验中，在$10~MHz$的最高相互作用速率下操作用于$Au+Au$碰撞，在其内径环中的第一个MUCH探测器站将面对$1~MHz/cm^2$的粒子速率之后。为了在如此高的粒子密度下运行，已为MUCH的前两个台站选择了基于GEM技术的探测器。我们早些时候已经报道了几个小尺寸的GEM探测器原型在VECC用于在MUCH的性能。在这项工作中，我们报告了一个大型GEM室原型测试质子束的动量$2.36~GeV/c$在COSY-Jüelich德国。使用在自触发模式下操作的nXYTER ASIC读出检测器。在$ΔV_{GEM}~=~375.2~V$下实现了比$96\%$更高的效率。当测试到最大速率$2.8~MHz/cm^2$时，已发现效率随进入质子速率的变化在$2\%$内变化。发现增益在高粒子速率下稳定，最大变化为$\sim~9\%$。

英文摘要：

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, after the first MUCH detector station in its inner radial ring will face a particle rate of $1~MHz/cm^2$. 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 chamber prototype tested with proton beam of momentum $2.36~GeV/c$ at COSY-Jüelich Germany. The detector was read out using nXYTER ASIC operated in self-triggering mode. An efficiency higher than $96\%$ at $ΔV_{GEM}~=~375.2~V$ 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 $2.8~MHz/cm^2$. The gain was found to be stable at high particle rate with a maximum variation of $\sim~9\%$.

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摘要：

英文摘要：

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