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

Abstract

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 wasmore » 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.« less

Authors:

Liang, Y. ^[1]; Wang, N. C.  ^[2];

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Ding, Y. H. ^[2]; Chen, Z. Y.  ^[2];

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Chen, Z. P.  ^[2];

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Yang, Z. J. ^[2]; Hu, Q. M.  ^[3];

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Cheng, Z. F.  ^[2];

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Wang, L.  ^[2];

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Jiang, Z. H.  ^[2];

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Rao, B. ^[2]; Huang, Z. ^[2]; Li, Y. ^[2]; Yan, W. ^[2]; Li, D. ^[2]; Liu, H. ^[4]; Zeng, L.  ^[5];

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Huang, Y. ^[2]; Huang, D. W. ^[2]; Lin, Z. F. ^[2] more »; Zheng, W. ^[2]; Hu, F. R. ^[2]; Zhao, K. J. ^[6]; Jiang, M. ^[7]; Shi, Y. J.  ^[8];

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Zhou, H. ^[2]; Peng, S. T. ^[2]; Guo, W. X.  ^[2];

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Gao, L. ^[2]; Wang, Z. J. ^[2]; Zhang, M.  ^[2];

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Yu, K. X. ^[2]; Hu, X. W. ^[2]; Yu, Q. ^[9]; Zhuang, G. ^[10]; Gentle, K. W. ^[11]; Pan, Y. ^[2] « less

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+ Show Author Affiliations

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

Publication Date:

2019-07-22

Research Org.:

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Sponsoring Org.:

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

Contributing Org.:

J-TEXT Team

OSTI Identifier:

1660948

Grant/Contract Number:  

2015GB111001; 2015GB111002; 2015GB120003; 2014GB118000; 11505069; 11575067; 11405068; 11275079

Resource Type:

Journal Article: Accepted Manuscript

Journal Name:

Nuclear Fusion

Additional Journal Information:

Journal Volume: 59; Journal Issue: 11; Journal ID: ISSN 0029-5515

Publisher:

IOP Science

Country of Publication:

United States

Language:

English