Development of a triple GEM UV-photon detector operated in pure CF4 for the PHENIX experiment
Development of a triple GEM UV-photon detector operated in pure CF4 for the PHENIX experiment
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为 PHENIX 实验开发在纯 CF4 中运行的三重 GEM 紫外光子探测器
DOI：
10.1016/j.nima.2003.12.018
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发表时间：
2003
影响因子：
1.4
通讯作者：
Japan.
中科院分区：
文献类型：
--
作者：
A. Kozlov;I. Ravinovich;L. Shekhtman;Z. Fraenkel;M. Inuzuka;I. T. W. I. O. Science;Rehovot;Israel;Budker Institute of Nuclear Physics;Novosibirsk;Russia.;U. Tokyo;Tokyo;Japan.
本文介绍了用三重气体电子倍增器（GEM）探测器在纯CF 4中工作时，采用和不采用反射式CsI光电阴极的结果。探测器在稳定模式下工作，增益高达104。当总电荷超过104 × 106 e时，偏离指数增长开始发展，导致当总电荷为102 × 107 e时增益饱和，并使结构相对稳定地抵抗放电。在阳极处的总累积电荷为10 mC/cm 2之后，在GEM箔中没有观察到老化效应。到反射光电阴极的离子回流电流与到阳极的电子电流相当。然而，没有观察到的CsI光电阴极的显着退化的总离子回流电荷为107 mC/cm 2。
Results obtained with a triple Gas Electron Multiplier (GEM) detector operated in pure CF4with and without a reflective CsI photocathode are presented. The detector operates in a stable mode at gains up to 104. A deviation from exponential growth starts to develop when the total charge exceeds ∼4×106e leading to gain saturation when the total charge is ∼2×107e and making the structure relatively robust against discharges. No aging effects are observed in the GEM foils after a total accumulated charge of ∼10 mC/cm2at the anode. The ion back-flow current to the reflective photocathode is comparable to the electron current to the anode. However, no significant degradation of the CsI photocathode is observed for a total ion back-flow charge of ∼7 mC/cm2.