Overview of the recent experimental research on the J-TEXT tokamak

Liang, Y.; Wang, N. C.; Ding, Y. H.; Chen, Z. Y.; Chen, Z. P.; Yang, Z. J.; Hu, Q. M.; Cheng, Z. F.; Wang, L.; Jiang, Z. H.; Rao, B.; Huang, Z.; Li, Y.; Yan, W.; Li, D.; Liu, H.; Zeng, L.; Huang, Y.; Huang, D. W.; Lin, Z. F.; Zheng, W.; Hu, F. R.; Zhao, K. J.; Jiang, M.; Shi, Y. J.; Zhou, H.; Peng, S. T.; Guo, W. X.; Gao, L.; Wang, Z. J.; Zhang, M.; Yu, K. X.; Hu, X. W.; Yu, Q.; Zhuang, G.; Gentle, K. W.; Pan, Y.

doi:10.1088/1741-4326/ab1a72

Title: Overview of the recent experimental research on the J-TEXT tokamak

Journal Article · 22 July 2019 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/ab1a72 · OSTI ID:1660948

Liang, Y. ^[1];

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Huazhong Univ. of Science and Technology, Wuhan (China); Forschungszentrum Jülich GmbH, Julich (Germany); Chinese Academy of Sciences (CAS), Hefei (China)
Huazhong Univ. of Science and Technology, Wuhan (China)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Southwest Jiaotong Univ., Chengdu (China)
Chinese Academy of Sciences (CAS), Hefei (China)
East China Univ. of Technology, Nanchang (China)
Southwest Inst. of Physics, Chengdu (China)
Seoul National Univ., Seoul (Korea)
Max-Planck-Inst. für Plasmaphysik, Garching (Germany)
Huazhong Univ. of Science and Technology, Wuhan (China); Univ. of Science and Technology of China, Hefei (China)
Univ. of Texas, Austin, TX (United States)

Recent J-TEXT research has highlighted the significance of the role that non-axisymmetric magnetic perturbations, so called three-dimensional (3D) magnetic perturbation (MP) fields, play in a fundamentally 2D concept, i.e. tokamaks. This paper presents the J-TEXT results achieved over the last two years, especially on the impacts of 3D MP fields on magnetohydrodynamic instabilities, plasma disruptions and plasma turbulence transport. On J-TEXT, the resonant MP (RMP) system, capable of providing either a static or a high frequency (up to 8 kHz) rotating RMP field, has been upgraded by adding a new set of 12 in-vessel saddle coils. The shattered pellet injection system was built in J-TEXT in the spring of 2018. The new capabilities advance J-TEXT to be at the forefront of international magnetic fusion facilities, allowing flexible study of 3D effects and disruption mitigation in a tokamak. The fast rotating RMP field has been successfully applied for avoidance of mode locking and the prevention of plasma disruption. A new control strategy, which applies pulsed RMP to the tearing mode only during the accelerating phase region, was proved by nonlinear numerical modelling to be efficient in accelerating mode rotation and even completely suppresses the mode. Remarkably, the rotating tearing mode was completely suppressed by the electrode biasing. The impacts of 3D magnetic topology on the turbulence has been investigated on J-TEXT. It is found that the fluctuations of electron density, electron temperature and plasma potential can be significantly modulated by the island structure, and a larger fluctuation level appears at the X-point of islands. The suppression of runaway electrons during disruptions is essential to the operation of ITER, and it has been reached by utilizing the 3D magnetic perturbations on J-TEXT. Finally, this may provide an alternative mechanism of runaway suppression for large-scale tokamaks and ITER.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE; National Magnetic Confinement Fusion Science Program of China; National Natural Science Foundation of China (NNSFC)

Contributing Organization:: J-TEXT Team

OSTI ID:: 1660948

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 11 Vol. 59; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Dissipation of runaway current by massive gas injection on J-TEXT Wei, Y. N.; Yan, W.; Chen, Z. Y. Plasma Physics and Controlled Fusion, Vol. 62, Issue 2 https://doi.org/10.1088/1361-6587/ab52c8	journal	November 2019
Formation of the non-axisymmetric helical current driven by a biased electrode in the scrape-off layer on J-TEXT Wang, Nengchao; Song, Zebao; Liang, Y. Nuclear Fusion, Vol. 59, Issue 9 https://doi.org/10.1088/1741-4326/ab2d03	journal	August 2019
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