Optimization of the electron collection efficiency of a large area MCP-PMT for the JUNO experiment
Optimization of the electron collection efficiency of a large area MCP-PMT for the JUNO experiment
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DOI：
10.1016/j.nima.2016.04.100
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发表时间：
2016-08-11
影响因子：
1.4
通讯作者：
Qi, Ming
中科院分区：
文献类型：
--
作者：
Chen, Lin;Tian, Jinshou;Qi, Ming
提出了一种基于微通道板的新型大面积(20英寸)光电倍增管(MCP-PMTS)，用于江门地下中微子观测站的实验。其光电子收集效率C-e受MCP开放面积分数(A(OPEN))的限制。考虑到MCP输入电极的二次电子发射，研究了该效率与输入电荷云中电子的角(Theta)、能量(E)分布以及PMT光电阴极和MCP输入表面之间的电势差(U)的函数关系。在CST Studio Suite中，将有限积分技术和蒙特卡罗方法相结合，研究了C-e与theta、E和U的关系。结果预测，C-e可以超过A(开度)，并被应用于20英寸MCP-PMT原型的结构和工作参数的优化。优化后的MCP-PMT的C-e比有望达到81.2%。最后，提出了减小MCP输入电极层的穿透深度和在MCP上沉积高二次电子产额材料以进一步优化C-e的建议。(C)2016爱思唯尔B.V.保留所有权利。
A novel large-area (20-inch) photomultiplier tube based on microchannel plate (MCP-PMTs) is proposed for the Jiangmen Underground Neutrino Observatory (JUNO) experiment. Its photoelectron collection efficiency C-e is limited by the MCP open area fraction (A(open)). This efficiency is studied as a function of the angular (theta), energy (E) distributions of electrons in the input charge cloud and the potential difference (U) between the PMT photocathode and the MCP input surface, considering secondary electron emission from the MCP input electrode. In CST Studio Suite, Finite Integral Technique and Monte Carlo method are combined to investigate the dependence of C-e on theta, E and U. Results predict that C-e can exceed A(open), and are applied to optimize the structure and operational parameters of the 20-inch MCP-PMT prototype. C-e of the optimized MCP-PMT is expected to reach 81.2%. Finally, the reduction of the penetration depth of the MCP input electrode layer and the deposition of a high secondary electron yield material on the MCP are proposed to further optimize C-e. (C) 2016 Elsevier B.V. All rights reserved.