New Current Control Method of DC Power Supply for Magnetic Perturbation Coils on J-TEXT

Abstract

In order to advance the research on suppressing tearing modes and driving plasma rotation, a DC power supply (PS) system has been developed for dynamic resonant magnetic perturbation (DRMP) coils and applied in the J-TEXT experiment. To enrich experimental phenomena in the J-TEXT tokamak, applying the circulating current four-quadrant operation mode in the DRMP DC PS system is proposed. By using the circulating current four-quadrant operation, DRMP coils can be smoothly controlled without the dead-time when the current polarity reverses. Essential circuit analysis, control optimization and simulation of desired scenarios have been performed for normal current. Relevant simulation and test results are also presented.

A brief review of the development and optimization of the three-dimensional magnetic configuration system in the J-TEXT tokamak

“…DRMP1 can produce AC RMPs because they are installed inside the vacuum vessel wall. A thyristor rectifier-based DC power supply and a series resonant inverter-based AC power supply are developed to produce a rotating RMP in the range of 1-6 kHz [18][19][20]. The m/ n=2/1 rotating RMP can reach an amplitude of around 0.5 Gs kA -1 .…”

Overview of the J-TEXT progress on RMP and disruption physics

“…The SRMP coils were fed with a DC power supply (PS) reconstructed from TEXT-U, while the DRMP coils were fed with either two DC PSs or two AC PSs. The DC PSs for DRMP coils can produce a maximum current of 7 kA with a pre-set waveform [22]. The two AC PSs use an AC-DC-AC converter including a series resonant inverter that can generate a maximum current of 5 kA in the frequency range from 800 Hz-6 kHz [23,24].…”