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The reporter learned from the Hefei Research Institute of the Chinese Academy of Sciences that the key project under construction of the Hefei Comprehensive National Science Center-the CRAFT project of the fusion reactor key system comprehensive research facility has received a good news. The Institute of Plasma Physics, Hefei Research Institute, Chinese Academy of Sciences is independently developing RF Significant progress has been made in the negative ion beam source, achieving stable and repeatable high current negative ion beam extraction in the order of hundreds of seconds.
The neutral beam injection system based on the radio frequency negative ion beam source is an important subsystem of the future fusion reactor. As a more efficient heating method, it is of great significance to realize the ignition and combustion plasma control of the fusion reactor. The key system comprehensive research facility project of the fusion reactor lists the development of a neutral beam injection system based on a radio frequency negative ion beam source as a technology that must be developed and a breakthrough that must be achieved. The radio frequency negative ion beam source is the most critical core equipment. It has the typical characteristics of high radio frequency feed stability, large beam extraction area, long continuous operation time, and difficult and easy loss of negative ions. The development of a complete set of radio frequency negative ion beam source technology is international Challenges faced by major nuclear fusion research units and the fusion community.
Since the start of the comprehensive research facility for the key system of the fusion reactor, the project team has accelerated the development of the prototype of the radio frequency negative ion beam source and its performance test experimental research. The prototype of the radio frequency negative ion beam source has been built to solve the problem of stable radio frequency power feeding in the generation and extraction of negative ions. The development of cesium injection system, the development of cesium cycle dynamics control, the development of magnetic filtration system and the performance verification, etc., realized the stable and repeatable 105-second high current negative ion beam extraction of the radio frequency negative ion beam source, and the negative ion extraction beam density reached 153A/m2 This parameter is obtained in accordance with the internationally used current sensor measurement method, which also makes China one of the few countries in the world that master the core technology. (Reporter Wu Changfeng)
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