Further progress in ion back-flow reduction with patterned gaseous hole-multipliers
Further progress in ion back-flow reduction with patterned gaseous hole-multipliers
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DOI：
10.1088/1748-0221/2/08/p08004
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发表时间：
2007-06
影响因子：
1.3
通讯作者：
A. Lyashenko;A. Breskin;R. Chechik;J. Veloso;J. Santos;F. Amaro
中科院分区：
文献类型：
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作者：
A. Lyashenko;A. Breskin;R. Chechik;J. Veloso;J. Santos;F. Amaro
本文提出了级联气相倍增器中反向漂移雪崩离子的静电偏离和捕获的新思想。它包括一个反转反向偏置微孔和条板(F-R-MHSP)元件，其条带面向乘法器的漂移区。来自连续倍增阶段的离子被这种电极有效地偏离和捕获。给出了F-R-MHSP与反向偏置微孔条板(R-MHSP)和气体电子倍增器(GEM)的离子阻挡能力的对比实验结果。以F-R-MHSP为第一倍增元件的探测器对级联空穴倍增器的离子阻断效果最好。一个三元件F-R-MHSP/GEM/MHSP级联乘法器工作在大气压Ar/CH4(95/5)中，总增益为~105，在漂移场为0.5和0.2kV/cm时，分别产生了3×104和1.5×10？4的离子回流分数。我们描述了F-R-MHSP的概念以及所获得的离子回流分数在各种应用中的相关性；还讨论了进一步的想法。
A new idea on electrostatic deviation and capture of back-drifting avalanche-ions in cascaded gaseous hole-multipliers is presented. It involves a flipped reversed-bias Micro-Hole & Strip Plate (F-R-MHSP) element, the strips of which are facing the drift region of the multiplier. The ions, originating from successive multiplication stages, are efficiently deviated and captured by such electrode. Experimental results are provided comparing the ion-blocking capability of the F-R-MHSP to that of the reversed-bias Micro-Hole & Strip Plate (R-MHSP) and the Gas Electron Multiplier (GEM). Best ion-blocking results in cascaded hole-multipliers were reached with a detector having the F-R-MHSP as the first multiplication element. A three-element F-R-MHSP/GEM/MHSP cascaded multiplier operated in atmospheric-pressure Ar/CH4 (95/5), at total gain of ~ 105, yielded ion back-flow fractions of 3?10?4 and 1.5?10?4, at drift fields of 0.5 and 0.2 kV/cm, respectively. We describe the F-R-MHSP concept and the relevance of the obtained ion back-flow fractions to various applications; further ideas are also discussed.