Property of LCP-GEM in Pure Dimethyl Ether at Low Pressure
Property of LCP-GEM in Pure Dimethyl Ether at Low Pressure
复制标题
低压纯二甲醚中 LCP-GEM 的性能
DOI：
10.1088/1748-0221/9/01/c01002
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发表时间：
2014
影响因子：
1.3
通讯作者：
T. Kohmura and the GENIS/XACT team
中科院分区：
文献类型：
--
作者：
Y. Takeuchi;T. Tamagawa;T. Kitaguchi;S. Yamada;W. Iwakiri;F. Asami;A. Yoshikawa;K. Kaneko;T. Enoto;A. Hayato;T. Kohmura and the GENIS/XACT team
我们提出了一个系统的研究增益特性的气体电子倍增器（GEM）箔在低压纯二甲醚（DME）。GEM由空间专用的覆铜液晶聚合物绝缘体（LCP-GEM）制成，应用于充满低压二甲醚气体的时间投影室，用于观测宇宙x射线的线极化。我们用6.4 keV的x射线测量了100 μm厚的LCP-GEM在10 ~ 190 Torr的不同气体压力下的增益与GEM电极间电压的关系。190托时的最大增益约为2× 104, 20托时的最大增益约为500。我们发现GEM增益的压力和电场依赖关系由第一汤森系数描述。4.5 ~ 8.0 keV的能量尺度为线性，30 Torr以上的非线性小于1.4%。
We present a systematic investigation of the gain properties of a gas electron multiplier (GEM) foil in pure dimethyl ether (DME) at low pressures. The GEM is made from copper-clad liquid crystal polymer insulator (LCP-GEM) designed for space use, and is applied to a time projection chamber filled with low-pressure DME gas to observe the linear polarization of cosmic X-rays. We have measured gains of a 100 μm-thick LCP-GEM as a function of the voltage between GEM electrodes at various gas pressures ranging from 10 to 190 Torr with 6.4 keV X-rays. The highest gain at 190 Torr is about 2× 10 4, while that at 20 Torr is about 500. We find that the pressure and electric-field dependence of the GEM gain is described by the first Townsend coefficient. The energy scale from 4.5 to 8.0 keV is linear with non-linearity of less than 1.4% above 30 Torr.