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Chin. Phys. B, 2021, Vol. 30(7): 075203    DOI: 10.1088/1674-1056/abfb52

Neoclassical tearing mode stabilization by electron cyclotron current drive for HL-2M tokamak

Jing-Chun Li(李景春)1,2,†, Jia-Qi Dong(董家齐)3, Xiao-Quan Ji(季小全)3, and You-Jun Hu(胡友俊)4
1 Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen 518000, China;
2 University of California, Irvine, California 92697, USA;
3 Southwestern Institute of Physics, Chengdu 610041, China;
4 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
Abstract  Investigation of neoclassical tearing mode and its suppression by electron cyclotron current drive (ECCD) has been carried out in HL-2M tokamak. The current driving capability of the electron cyclotron wave is evaluated. It is found that the deposition location can be effectively controlled by changing the poloidal angle. The validation of electron cyclotron wave heating and current driving has been demonstrated for the upper launcher port. We show that 3.0 MW and 2.5 MW modulated ECCD can completely stabilize (2,1) and (3,2) NTMs, respectively. The non-modulated ECCD, radial misalignment as well as current profile broadening have deleterious effect on the NTM stabilization. The time required for suppression of (3,2) mode is shorter than that required for the suppression of (2,1) mode. Moreover, the time needed for complete stabilization at different initial island width has been quantitatively presented and analyzed.
Keywords:  neoclassical tearing mode      magnetic island      electron cyclotron current drive      numerical modelling  
Received:  12 March 2021      Revised:  19 April 2021      Accepted manuscript online:  26 April 2021
PACS:  52.35.Hr (Electromagnetic waves (e.g., electron-cyclotron, Whistler, Bernstein, upper hybrid, lower hybrid))  
  52.55.Fa (Tokamaks, spherical tokamaks)  
  52.55.Wq (Current drive; helicity injection)  
  52.35.Py (Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.))  
Fund: Project supported by the National Key Research and Development Program of China (Grant Nos. 2018YFE0303102, 2018YFE0301100, and 2017YFE0301702), the National Natural Science Foundation of China (Grant Nos. 11905109 and 11947238), U.S. DOE SciDAC ISEP, users with Excellence Program (on EAST tokamak) of Hefei Science Center CAS under (Grant No. 2021HSC-UE017), and the Center for Computational Science and Engineering of Southern University of Science and Technology.
Corresponding Authors:  Jing-Chun Li     E-mail:

Cite this article: 

Jing-Chun Li(李景春), Jia-Qi Dong(董家齐), Xiao-Quan Ji(季小全), and You-Jun Hu(胡友俊) Neoclassical tearing mode stabilization by electron cyclotron current drive for HL-2M tokamak 2021 Chin. Phys. B 30 075203

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