China Jinping Underground Laboratory Phase II Extremely Deep Underground Extremely Low Radiation Background Frontier Physics Experimental Facility (referred to as "Jinping Large Facility") was completed on December 7, with experimental conditions. This marks that the world's deepest and largest underground laboratory has been put into scientific operation. The first batch of 10 experimental projects from Tsinghua University, Shanghai Jiaotong University, Beijing Normal University, China Institute of Atomic Energy Science, Wuhan Institute of Rock and Soil Mechanics, Chinese Academy of Sciences and other universities and research institutes were stationed to carry out scientific experiments.
Jinping Large Facility is the second phase project of China Jinping Underground Laboratory, located 2400 meters underground in Jinping Mountain, Liangshan Yi Autonomous Prefecture, Sichuan Province, with a total volume of 330000 cubic meters. The laboratory cosmic ray flux is only one hundred million times that of the surface, which has many advantages such as "extremely low environmental radon emission", "extremely low environmental radiation", "ultra-low cosmic ray flux" and "ultra-clean space". In order to achieve lower radiation background requirements, all equipment and materials are customized, and low-radiation cement, carborundum, rock wool and a number of low-radiation mechanical and electrical equipment have been successfully developed and produced, which are the first in the world to maximize the control of laboratory radiation background and create the most "pure" experimental environment. Jinping Underground Laboratory, the second phase of Jinping Underground Laboratory in
China,
is an excellent place for dark matter research in China. In December 2010, the first phase of Jinping Underground Laboratory was completed and put into operation by Tsinghua University and Yalong River Basin Hydropower Development Co., Ltd. of SDIC Group in the mode of school-enterprise cooperation, which filled the gap of deep-earth laboratory in China. The first batch of CDEX experimental group of Tsinghua University and PandaX experimental group of Shanghai Jiaotong University filled the gap of dark matter research in China. Since the first phase was put into operation, many international leading scientific research achievements have been made in the fields of dark matter detection and nuclear astrophysics.
In 2014, the second phase project of Jinping Underground Laboratory was approved as a major national science and technology infrastructure, and the planned underground available experimental space increased from 4000 cubic meters to 330000 cubic meters. During the construction of the project, the waterproof and radon suppression technology was initiated, the low background equipment materials were developed, the radiation background of the laboratory was controlled to the maximum extent, and the "pure" experimental environment was created. Cheng Jianping, director of Jinping Underground Laboratory
of China Dark Matter Experiment CDEX-1T Large Liquid Nitrogen Thermostat
and Secretary of the Party Committee of Beijing Normal University, said that as an open and shared large scientific device. The construction of Jinping Large Facility provides a first-class experimental environment for dark matter, neutrinos, nuclear astrophysics and other frontier topics, as well as an excellent research platform for deep-earth rock mechanics, deep-earth medicine and other deep-earth sciences. In the future, the laboratory will become a world-class interdisciplinary deep-seated scientific research center, helping the national science and technology innovation platform to "leapfrog promotion".
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