Collection of Photoelectrons and Operating Parameters of CsI Photocathode GEM Detectors
Collection of Photoelectrons and Operating Parameters of CsI Photocathode GEM Detectors
复制标题
CsI 光电阴极 GEM 探测器的光电子采集和工作参数
DOI：
--
复制
发表时间：
2009
影响因子：
1.8
通讯作者：
C. Woody
中科院分区：
文献类型：
--
作者：
B. Azmoun;A. Caccavano;Z. Citron;M. Durham;T. Hemmick;J. Kamin;M. Rumore;C. Woody
本文研究了三重GEM探测器中影响CsI光电阴极表面光电子提取和收集的参数。本研究的目的是优化PHENIX强子盲探测器（HBD）的光电子收集效率和GEM操作条件。研究的参数包括在光电阴极的表面处的电场，跨GEM的电压，GEM下方的电场，光电子被提取到的介质（气体或真空），以及提取效率的波长依赖性。一个小的，校准的光源，或ldquoscintillation cuberd被用来照亮GEM CsI光电阴极与已知的光子通量产生的闪烁光从5.48 MeV的α粒子在CF4。通过将产生的光电子的数量与在GEM读出焊盘处收集的数量进行比较来计算光电子收集效率。研究了影响光电子收集效率的参数，给出了闪烁体的结构和标定结果。
A study has been made of the parameters affecting the extraction and collection of photoelectrons from the surface of a CsI photocathode in a triple GEM detector. The purpose of this study was to optimize the photoelectron collection efficiency and GEM operating conditions for the PHENIX Hadron Blind Detector (HBD) at RHIC. The parameters investigated include the electric field at the surface of the photocathode, the voltage across the GEM, the electric field below the GEM, the medium into which the photoelectrons are extracted (gas or vacuum), and the wavelength dependence of the extraction efficiency. A small, calibrated light source, or ldquoscintillation cuberdquo was used to illuminate a GEM CsI photocathode with a known photon flux produced by the scintillation light from 5.48 MeV alpha particles in CF4. The photoelectron collection efficiency was calculated by comparing the number of photoelectrons produced to the number collected at the GEM readout pad. Results are presented on the study of the parameters affecting the photoelectron collection efficiency and the construction and calibration of the scintillation cube.