用于COMPASS实验的低放电率新型像素化Micromegas探测器
New pixelized Micromegas detector with low discharge rate for the COMPASS experiment
摘要：
新的Micromegas（微网气体探测器）正在根据欧洲核子研究中心COMPASS合作计划的未来物理项目开发。与目前的探测器相比，几个主要的升级正在研究中：探测器的亮度比强子束高5倍，探测束粒子（通量高达几百kHz/mm^{2}，比目前的Micromegas探测器大10倍），中央部分像素化读出，光和集成电子器件，以及改进的鲁棒性。已经研究了两种减少放电影响的解决方案，Micromegas探测器使用电阻层和使用额外的GEM箔。还测量了这种探测器的性能。2010年在COMPASS生产并安装了一个具有标称有效面积和像素化读出的大尺寸原型。2011年，在COMPASS安装了具有额外GEM箔的原型以及电阻原型，这些探测器的初步结果表现出非常好的性能。我们在这里提出的项目，并报告其状态，特别是大尺寸的原型与额外的创业板箔的性能。
英文摘要：
New Micromegas (Micro-mesh gaseous detectors) are being developed in view of the future physics projects planned by the COMPASS collaboration at CERN. Several major upgrades compared to present detectors are being studied: detectors standing five times higher luminosity with hadron beams, detection of beam particles (flux up to a few hundred of kHz/mm^{2}, 10 times larger than for the present Micromegas detectors) with pixelized read-out in the central part, light and integrated electronics, and improved robustness. Two solutions of reduction of discharge impact have been studied, with Micromegas detectors using resistive layers and using an additional GEM foil. Performance of such detectors has also been measured. A large size prototypes with nominal active area and pixelized read-out has been produced and installed at COMPASS in 2010. In 2011 prototypes featuring an additional GEM foil, as well as an resistive prototype, are installed at COMPASS and preliminary results from those detectors presented very good performance. We present here the project and report on its status, in particular the performance of large size prototypes with an additional GEM foil.
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