Text/Yangcheng Evening News All-Media Reporter Chen Zhuodong Correspondent Jiang Xun Sun Zifa Liu Yuexiang Tan Yaoguang
Reporters learned from the Institute of High Energy Physics, Chinese Academy of Sciences on the 27th that the equipment construction of the Jiangmen Neutrino Experiment , which is responsible for the implementation of the unit, has made further progress. Starting today, in the experimental hall 700 meters underground, the last assembly unit of the stainless steel main structure of the central detector, its core detection equipment, was hoisted and closed. This also marks the successful completion of the installation of the stainless steel main structure of the central detector. In the next step, the central detector will enter the on-site installation stage of the plexiglass ball.
The reporter learned that the Jiangmen Neutrino Experiment is located in Kaiping, Jiangmen. It is a large scientific facility jointly constructed by the Chinese Academy of Sciences and Guangdong Province. It is also a large-scale international cooperation projects. Construction began in 2015 and is planned to be completed and operational in 2023. The main scientific goals are to determine the mass sequence of neutrinos and , accurately measure neutrino mixing parameters, and conduct many other scientific frontier researches. The implementation of the Jiangmen Neutrino Experiment will further consolidate my country's leading position in the field of neutrino research and become one of the centers of international neutrino research.
The relevant person in charge of the Institute of High Energy Physics of the Chinese Academy of Sciences introduced that the central detector, the core detection equipment of the Jiangmen neutrino experiment, is located in the center of a 44-meter deep pool in the underground experimental hall in Kaiping, Jiangmen. Its stainless steel main structure is designed to be spherical with a diameter of about 41 meters. The structure form of reticulated shell is also called stainless steel reticulated shell. As the main support structure of the detector, it will carry a 35.4-meter-diameter organic glass sphere, 20,000 tons of liquid scintillator, 20,000 20-inch photomultiplier tubes , 25,000 3-inch photomultiplier tubes, and front-end electronics. Electronics, cables, antimagnetic coils, light barriers and many other key components. The stainless steel main structure is made of prefabricated welded H-shaped steel spliced by 120,000 sets of high-strength bolts . The structural manufacturing precision is very high. The installation gap between the connecting holes and the ring groove rivets does not exceed 1 mm. The spherical mesh shell mesh The grid assembly accuracy is less than 3 mm, making it the largest single stainless steel main structure in China.
It is reported that after the stainless steel main structure is closed, the on-site installation of plexiglass balls will also begin. The plexiglass ball in the central detector structure has a diameter of 35.4 meters, a wall thickness of 120 mm, and a weight of more than 600 tons. It is the largest single plexiglass structure in the world. Its production and construction have no precedent at home and abroad. How to break through traditional processes , successfully completing the construction of this sphere in a short period of time is another huge challenge facing the project team.
Source | Yangcheng Evening News·Yangcheng School
editor | Huang Ti'an
