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- W2939228416 abstract "Tearing mode creates magnetic islands and easily causes a disruption in the tokamak. A new method to control the tearing mode has been proposed. The external resonant magnetic perturbation (RMP) coils are used to create modulated magnetic perturbation in certain magnetic island phase region. In the region of -0.5π to -π, RMP has an accelerating and stabilizing effects on tearing mode. To verify the mechanism, two variable frequency current-pulse power supplies have been developed, which have the maximum frequency of 8 kHz and the current of 3 kA. In this paper, the phase-detection-based and frequency feedback control are introduced. A fast island phase identification theory is used in the feedback control system to provide the magnetic island phase information in real time. It uses a poloidal array of Mirnov probes to identify the O-point of the magnetic island. There is a current amplitude feedback control to adjust the strength of RMP field. A bypass is used in the power supply to establish the output current quickly in initial period and protect the inverter. Finally, the feedback control system and the new power supplies have been used on the J-TEXT tokamak and two control methods are compared." @default.
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- W2939228416 date "2019-09-01" @default.
- W2939228416 modified "2023-10-16" @default.
- W2939228416 title "Phase-detection-based feedback control for the power supply in tearing mode control system on J-TEXT" @default.
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- W2939228416 doi "https://doi.org/10.1016/j.fusengdes.2019.03.122" @default.
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