Recently, the Institute of plasma physics, Hefei Institute of material sciences, Chinese Academy of Sciences, has made important progress in independently developing fusion engineering technology, i.e. research on emission frequency negative ion beam source, realizing stable and repeatable extraction of 100 second strong current negative ion beam.

The Chinese Academy of Sciences has made a major breakthrough in the research and development of radio frequency negative ion beam source to promote nuclear fusion

Neutral beam injection system based on radio frequency negative ion beam source is an important subsystem of future fusion reactor. As a more efficient heating method, it is of great significance to realize ignition and combustion plasma control of fusion reactor. The research and development of neutral beam injection system based on radio frequency negative ion beam source is listed as a necessary technology and breakthrough in the comprehensive research facility project of fusion reactor host key system. Radio frequency negative ion beam source is one of the most critical core equipment, which has the typical characteristics of high stability requirements of radio frequency feeding, large beam extraction area, long continuous operation time, and difficult and easy loss of negative ions. The research and development of a complete set of radio frequency negative ion beam source technology is a common challenge faced by major international nuclear fusion research institutions and fusion industry.

Since the start of the comprehensive research facility of fusion reactor host key system, a key project under construction in Hefei comprehensive national science center, the project team of Hefei Research Institute of Chinese Academy of Sciences has accelerated the development of the prototype of radio frequency negative ion beam source and the experimental research on its performance test, and completed the prototype of radio frequency negative ion beam source, which has solved the problem of RF power stability in the generation and extraction of negative ions The stable and repeatable 105 second high current negative ion beam extraction of RF negative ion source is realized. The current density of negative ion extraction reaches 153a / m2. This parameter is obtained according to the international common measurement method using current sensor, which makes our country become one of the few masters in the world The core technology of the country.

Relying on more than ten years of experience and technology accumulation in the construction and operation of the neutral beam injection system of the all superconducting Tokamak EAST device, the project team of Hefei Research Institute of Chinese Academy of Sciences insists on independent research and development, breaks through the challenges in the development and stable operation of the RF negative ion beam source, and develops the key technologies in the development and operation of the RF negative ion beam source. The related work also provides an important guarantee for the smooth construction of the neutral beam injection system of the radio frequency negative ion beam source and the comprehensive research facility of the key system of the fusion reactor host, and lays a good foundation for the design and development of the neutral beam injection system of the fusion reactor.

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