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China's fully superconducting Tokamak nuclear fusion experimental device has made a major breakthrough


At 0:26 a.m. on January 28, the fully superconducting Tokamak nuclear fusion experimental device EAST of the Hefei Institute of Materials Sciences of the Chinese Academy of Sciences successfully realized the ultra-high temperature long pulse plasma discharge with an electron temperature of more than 50 million degrees Celsius and a duration of 102 seconds, which is the longest plasma discharge with an electron temperature of 50 million degrees Celsius on the international Tokamak experimental device.

Ultra-high temperature long pulse plasma discharge is the basic operation mode of future fusion reactor. At present, most of the international magnetic confinement fusion experimental devices are conventional non-superconducting Tokamak, and the duration of the divertor configuration plasma is basically less than 20 seconds. Only the European Union and Japanese scientists have obtained the high-parameter divertor plasma with a maximum length of 60 seconds. The established scientific goal of EAST is to achieve 100 million degrees and 1000 seconds of plasma operation, but the realization of this scientific goal still faces many scientific and technological challenges. Since this round of experiment, the scientific researchers of the EAST team have solved a series of key scientific and engineering technical problems day and night: the precise control of the magnetic configuration of the long-pulse plasma, the safe operation technology of the full superconducting magnet, and the stable and effective plasma heating and current drive. Through integrated innovation and comprehensive experimental research, using the co-heating of low hybrid wave and electron cyclotron wave and current drive, under the co-heating of neutral beam, EAST successfully achieved a high temperature plasma discharge of 102 seconds, plasma current of 0.4 MPa, and core electron temperature of more than 50 million degrees Celsius.

 Experts pointed out that the above achievements are of milestone significance in the future research of fusion reactors, marking that China continues to lead the world in the research of steady-state magnetic confinement fusion. At present, EAST has become an important experimental platform for steady state magnetic confinement fusion research in the world. Its research results will provide scientific and engineering experimental support for the realization of steady state high confinement discharge of ITER in the future, and will continue to lay an important scientific foundation for the preliminary research of the next generation of fusion device in China - China Fusion Engineering Experimental Reactor.



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