Tunable biasing magnetic field design of ferrite tuner for ICRF heating system in EAST

Manman XU (徐曼曼); Yuntao SONG (宋云涛); Gen CHEN (陈根); Yanping ZHAO (赵燕平); Yuzhou MAO (毛玉周); Guang LIU (刘广); Zhen PENG (彭振)

doi:10.1088/2058-6272/aa8167

Plasma Science and Technology > 2017 > 19(11): 115601. > DOI: 10.1088/2058-6272/aa8167

Manman XU (徐曼曼), Yuntao SONG (宋云涛), Gen CHEN (陈根), Yanping ZHAO (赵燕平), Yuzhou MAO (毛玉周), Guang LIU (刘广), Zhen PENG (彭振). Tunable biasing magnetic field design of ferrite tuner for ICRF heating system in EAST[J]. Plasma Science and Technology, 2017, 19(11): 115601. DOI: 10.1088/2058-6272/aa8167

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Tunable biasing magnetic field design of ferrite tuner for ICRF heating system in EAST

1 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China 2 University of Science and Technology of China, Hefei 230026, People’s Republic of China

Funds: This work is supported by National Natural Science Foundation of China (Grant No. 11575237), the National Magnetic Confinement Fusion Science Program (Grant No. 2015GB101001), and the International Scientific and Technological Cooperation Project of Anhui (Grant No. 1704e1002207).

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Received Date: May 23, 2017

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Abstract

Abstract

Ion cyclotron range of frequency (ICRF) heating has been used in tokamaks as one of the most successful auxiliary heating tools and has been adopted in the EAST. However, the antenna load will fluctuate with the change of plasma parameters in the ICRF heating process. To ensure the steady operation of the ICRF heating system in the EAST, fast ferrite tuner (FFT) has been carried out to achieve real-time impedance matching. For the requirements of the FFT impedance matching system, the magnet system of the ferrite tuner (FT) was designed by numerical simulations and experimental analysis, where the biasing magnetic circuit and alternating magnetic circuit were the key researched parts of the ferrite magnet. The integral design goal of the FT magnetic circuit is that DC bias magnetic field is 2000 Gs and alternating magnetic field is ±400 Gs. In the FTT, E-type magnetic circuit was adopted. Ferrite material is NdFeB with a thickness of 30 mm by setting the working point of NdFeB, and the ampere turn of excitation coil is 25 through the theoretical calculation and simulation analysis. The coil inductance to generate alternating magnetic field is about 7 mH. Eddy-current effect has been analyzed, while the magnetic field distribution has been measured by a Hall probe in the medium plane of the biasing magnet. Finally, the test results show the good performance of the biasing magnet satisfying the design and operating requirements of the FFT.
- EAST,
- ICRF heating,
- ferrite tuner,
- biasing magnet

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Tunable biasing magnetic field design of ferrite tuner for ICRF heating system in EAST