Recently, the Cooperative Group for Large Area Photomultiplier Tubes (hereinafter referred to as the Cooperative Group) led by the Institute of High Energy Physics, Chinese Academy of Sciences (hereinafter referred to as High Energy Institute) announced that the first 7500-inch 20-inch microchannel Plate photomultiplier tube production line was put into operation. In the next two years, China North Industries Group North Night Vision Technology Co., Ltd. will provide 15,000 products for the pilot project of science and technology of Jiangmen Science and Technology Association of Jiangmen Municipality - Jiangmen.
The completion and operation of this production line marks the formal entry of 20-inch PMTs into mass production. It is not only an example of the organic combination of industry, academia and research, but will also serve as a solid foundation for China's research in neutrino experiments.
Invisible neutrinos, touching only weak interactions, even with the liquid scintillator interaction produces only a small number of photons, very difficult to detect. To detect neutrinos, we need a very weak optical detection technology called photomultiplier technology, which detects weak optical signals, with high sensitivity and ultra-fast time response, like a hunter keen eye.
"The new 20-inch photomultiplier tube represents the highest level of technology in PMT." Wang Yifang, director of the High Energy Institute, told China Science Daily that PMT is a key common component in particle physics and nuclear physics experiments Converts optical signals into electrical signals.
It is reported that in 2008, when the High Energy proposed the Daya Bay Neutrino Experimental Phase II experiment (now renamed "Jiangmen Neutrino Experiment"), the more than 2,000 8-inch photomultiplier tubes used in the Daya Bay neutrino experiments were produced by the United States Buy from Japan.
In this context, high-energy decided to launch a new type of photomultiplier tube pre-research and hope to achieve localization. By the end of 2011, led by the company, and North Night Vision Technology Co., Ltd., Chinese Academy of Sciences Xi'an Institute of Optics and Fine Mechanics, China Nuclear Control System Co., Ltd. and Nanjing University and other units to form a cooperation group.
Cooperation team spent four years, overcome the high quantum efficiency of photocathode preparation technology, microchannel plate, large size glass bulb and many other technical difficulties, and ultimately developed a quantum efficiency, collection efficiency and single-photo-electronic peak-to-valley ratio and other key technical indicators To the international advanced level of the sample tube.
This reporter has learned that Jiangmen Neutrino Experimental Project will be the end of 2018 to start the installation of photomultiplier tube and is expected to begin around 2020 data collection neutrino experiments.
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