大面积高量子效率双碱光阴极研究与制备

This project focuses on the hot research topic of high quantum efficiency (QE) photocathode and provides a development (or fabrication) plan for large area bialkali photocathode with high QE to meet the massive needs of photomultiplier tubes (PMT) in the next generation neutrino experiment. This project is also an advanced research based on prior project "A new type of PMT with Microchannel plate (MCP)", supported by the National Natural Science Foundation of China (NSFC) in 2012. The new project aims to improve the QE of normal bialkali photocathode from 20% to 30% and achieve the 20 inch area photocathode with high surface uniformity and long-term stability. With the collaboration of several institutes in China and Argonne national laboratory in US, we will develop photocathode theory, fabricate prototype photocathode and perform test analysis. Through joint efforts, we will not only study and develop high QE large area photocathode, but also engage in procedure design and development to reach a widely applicable manufacture technology. The main goal of this project is to achieve high QE photocathodes with peak QE at wavelength around 410nm, which matches the emission spectrum of liquid scintillator for neutrino detection. The high QE photocathode will improve the sensitivity of neutrino detectors which will be used in DayaBay II so that the data analysis accuracy can be promoted and new physics phenomenon may be discovered. This project will also strengthen the technology of PMT manufactures in China and enhance their international competitiveness.

在承担新型微通道板光电倍增（MCP-PMT）研制工作的基础上,针对本领域最新热点 "高量子效率光阴极研究",结合下一代中微子实验对大面积PMT的需求,提出大面积高量子效率双碱光阴极的研究和制备计划。联合国内多家研究机构和美国阿冈国家实验室相关课题组,发挥研究团队的各自优势,从理论研究,样管制备和测试分析入手,在将普通双碱光阴极量子效率从20%提高到30%,并最终实现20英寸大面积光阴极的制备,并保证其表明均匀性和长期稳定性。通过联合攻关,研究和制备大面积高量子效率光阴极,并进行工艺设计和开发,得到可在工业界推广的工艺技术。有针对性的设计分支波长在410nm的高量子效率光阴极,使其与探测中微子信号的液体闪烁体发光峰值波长相匹配。此项研究将会进一步提高大亚湾II计划对中微子探测器的灵敏度,有利于物理数据的分析和物理成果的发现;也将有助于提高国内PMT生产企业的整体技术实力,提高其国际竞争。

在承担新型微通道板光电倍增（MCP-PMT）研制工作的基础上,针对本领域最新热点 “高量子效率光阴极研究”,结合下一代中微子实验对大面积PMT的需求,提出大面积高量子效率双碱光阴极的研究和制备计划。联合国内多家研究机构和美国阿冈国家实验室相关课题组,北方夜视技术股份有限公司南京分公司，发挥研究团队的各自优势,从理论研究,样管制备和测试分析入手,将普通双碱光阴极量子效率从20%提高到30%,并最终实现20英寸大面积光阴极的制备,并保证其表明均匀性和长期稳定性。通过联合攻关,研究和制备大面积高量子效率光阴极,并进行工艺设计和开发,得到可在工业界推广的工艺技术。有针对性的设计分支波长在400nm的高量子效率光阴极,使其与探测中微子信号的液体闪烁体发光峰值波长相匹配。.本研究课题，完成研究目标，研制出满足验收指标的高量子效率光阴极的光电倍增管，已经在企业的生产线得到具体的应用，稳定提升了生产的产品质量。同时发表英文SCI文章7篇，其中，第一作者或通讯作者4篇；中文核心文章8篇，第一作者或通讯作者7篇。同时，申请相关专利17项，项目负责人作为第一发明人的专利8项。.此项研究将会进一步提高江门中微子实验对中微子探测器的灵敏度,有利于物理数据的分析和物理成果的发现;也将有助于提高国内PMT生产企业的整体技术实力,提高其国际竞争。