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

Abstract

The J-TEXT tokamak is featured with the experimental studies by the three-dimensional magnetic configuration system. The system mainly includes three subsystems: static resonant magnetic perturbation (SRMP) system, dynamic resonant magnetic perturbation (DRMP) system and helical coil system. The SRMP coils consist of two kinds of coils, i.e. three 6-loops coils and two 5-loops coils, it can suppress tearing mode with a moderate strength, and may also cause mode locking with lager amplitude. DRMP coils consisting of 12 single-turn saddle coils (DRMP1) and 12 double-turns saddle coils (DRMP2), its magnetic field can be rotated at a few kilo-Hertz, leading to either acceleration or deceleration of the tearing mode velocity and the plasma rotation. The helical coil system consists of two closed coils, and it has been under construction for providing external rotation transform on J-TEXT. The 3D magnetic configuration system can suppress tearing mode, then prevent and avoid the occurrence of major disruption.

Development of a toroidal soft x-ray imaging system and application for investigating three-dimensional plasma on J-TEXT

“…On J-TEXT, a poloidal SXR diagnostic system has been utilized to observe MHD activities [14] when applying external resonant magnetic perturbations [15][16][17][18][19][20][21][22][23]. Nevertheless, the toroidally asymmetrical plasma shape and MHD activities have 3D structures, and these structures can hardly be observed and reconstructed by just a single array at each toroidal position or multiple arrays at a single toroidal position.…”