Combination of two Gas Electron Multipliers and a Micromegas as gain elements for a time projection chamber
Combination of two Gas Electron Multipliers and a Micromegas as gain elements for a time projection chamber
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DOI：
10.1016/j.nima.2016.08.007
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发表时间：
2016-03
影响因子：
1.4
通讯作者：
S. Aiola;R. Ehlers;S. Gu;J. Harris;R. Majka;J. Mulligan;M. Oliver;J. Schambach;N. Smirnov
中科院分区：
文献类型：
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作者：
S. Aiola;R. Ehlers;S. Gu;J. Harris;R. Majka;J. Mulligan;M. Oliver;J. Schambach;N. Smirnov
我们测量了一种新的组合的两个气体电子倍增器与Micromegas作为放大装置在高速率气体时间投影室使用的属性。这种设计的目标是最大限度地减少这种探测器的漂移体积中的空间电荷的积累，以消除标准的门控网格及其产生的死区时间，同时保持良好的跟踪和粒子识别性能。为了表征这种微图案气体检测器配置，我们使用各种气体测量了在各种元件增益和电场下的正离子回流和能量分辨率，并且另外研究了串扰效应和放电速率。在增益为2000时，这种配置实现了低于0.4%的离子回流和优于σ/E= 12%的55 Fe X射线的能量分辨率。
We measured the properties of a novel combination of two Gas Electron Multipliers with a Micromegas for use as amplification devices in high-rate gaseous time projection chambers. The goal of this design is to minimize the buildup of space charge in the drift volume of such detectors in order to eliminate the standard gating grid and its resultant dead time, while preserving good tracking and particle identification performance. To characterize this micro-pattern gas detector configuration, we measured the positive ion back-flow and energy resolution at various element gains and electric fields, using a variety of gases, and additionally studied crosstalk effects and discharge rates. At a gain of 2000, this configuration achieves an ion back-flow below 0.4% and an energy resolution better than σ/E= 12% for 55 Fe X-rays.