Stabilization of a model magnetic island in tokamaks by localized electron cyclotron current drive (ECCD) has been studied using a fluid-kinetic hybrid model coupled with ray tracing and Fokker−Planck equations. Even though a gyrokinetic toroidal code at present is not able to simulate the long-time evolution of tearing modes, which starts from small perturbation and evolves to the Rutherford regime, we can still calculate a model magnetic island and its stabilization by ECCD. Gyrokinetic simulations find that the model magnetic island can be fully stabilized by the ECCD with the 1 MW 68 GHz X2-mode in HL-2A-like equilibrium, while the model magnetic island in the DIII-D tokamak is only partially stabilized with the same ECCD power. A helicoidal current drive is more efficient than a continuous ECCD to stabilize the model magnetic island. Simulation results further indicate that, without external current drive, thermal ion kinetic effects could also reduce the magnetic island width and the linear growth rate of tearing modes.
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April 2020
Research Article|
April 02 2020
GTC simulation of linear stability of tearing mode and a model magnetic island stabilization by ECCD in toroidal plasma
Jingchun Li;
Jingchun Li
a)
1
Fusion Simulation Center, Peking University
, Beijing 100871, People's Republic of China
2
School of Physics, Nankai University
, Tianjin 300071, People's Republic of China
3
University of California
, Irvine, California 92697, USA
a)Author to whom correspondence should be addressed: jingchunli@pku.edu.cn
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Chijie Xiao;
Chijie Xiao
1
Fusion Simulation Center, Peking University
, Beijing 100871, People's Republic of China
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Zhihong Lin
;
Zhihong Lin
3
University of California
, Irvine, California 92697, USA
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Dongjian Liu
;
Dongjian Liu
4
Sichuan University
, Chengdu 610064, People's Republic of China
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Xiaoquan Ji;
Xiaoquan Ji
5
Southwestern Institute of Physics
, Chengdu 610041, People's Republic of China
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Xiaogang Wang
Xiaogang Wang
a)
6
Harbin Institute of Technology
, Harbin 150001, People's Republic of China
a)Author to whom correspondence should be addressed: jingchunli@pku.edu.cn
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a)Author to whom correspondence should be addressed: jingchunli@pku.edu.cn
Phys. Plasmas 27, 042507 (2020)
Article history
Received:
May 23 2019
Accepted:
March 16 2020
Citation
Jingchun Li, Chijie Xiao, Zhihong Lin, Dongjian Liu, Xiaoquan Ji, Xiaogang Wang; GTC simulation of linear stability of tearing mode and a model magnetic island stabilization by ECCD in toroidal plasma. Phys. Plasmas 1 April 2020; 27 (4): 042507. https://doi.org/10.1063/1.5111127
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