Effects of counter-current driven by electron cyclotron waves on neoclassical tearing mode suppression

doi:10.1088/1674-1056/ad23d3

中国物理B ›› 2024, Vol. 33 ›› Issue (5): 55202-055202.doi: 10.1088/1674-1056/ad23d3

Effects of counter-current driven by electron cyclotron waves on neoclassical tearing mode suppression

Qin Gao(高钦) and Ping-Wei Zheng(郑平卫)¹

1 School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, China;
2 Demonstration Base for International Science and Technology Cooperation on Nuclear Energy and Nuclear Safety, University of South China, Hengyang 421001, China

收稿日期:2023-10-13 修回日期:2023-12-17 接受日期:2024-01-30 出版日期:2024-05-20 发布日期:2024-05-20
通讯作者: Ping-Wei Zheng E-mail:pwzheng@usc.edu.cn
基金资助:
Project supported by the National Key R&D Program of China (Grant Nos. 2022YFE03070000 and 2022YFE03070003), the National Natural Science Foundation of China (Grant Nos. 12375220 and 12075114), the Hunan Provincial Natural Science Foundation (Grant No. 2021JJ30569), the Doctoral Initiation Fund Project of University of South China (Grant No. 190XQD114), the Hunan Nuclear Fusion International Science and Technology Innovation Cooperation Base (Grant No. 2018WK4009), and the Hengyang Key Laboratory of Magnetic Confinement Nuclear Fusion Research (Grant No. 2018KJ108).

Effects of counter-current driven by electron cyclotron waves on neoclassical tearing mode suppression

Qin Gao(高钦) and Ping-Wei Zheng(郑平卫)¹

1 School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, China;
2 Demonstration Base for International Science and Technology Cooperation on Nuclear Energy and Nuclear Safety, University of South China, Hengyang 421001, China

Received:2023-10-13 Revised:2023-12-17 Accepted:2024-01-30 Online:2024-05-20 Published:2024-05-20
Contact: Ping-Wei Zheng E-mail:pwzheng@usc.edu.cn
Supported by:
Project supported by the National Key R&D Program of China (Grant Nos. 2022YFE03070000 and 2022YFE03070003), the National Natural Science Foundation of China (Grant Nos. 12375220 and 12075114), the Hunan Provincial Natural Science Foundation (Grant No. 2021JJ30569), the Doctoral Initiation Fund Project of University of South China (Grant No. 190XQD114), the Hunan Nuclear Fusion International Science and Technology Innovation Cooperation Base (Grant No. 2018WK4009), and the Hengyang Key Laboratory of Magnetic Confinement Nuclear Fusion Research (Grant No. 2018KJ108).

摘要/Abstract

摘要： Through theoretical analysis, we construct a physical model that includes the influence of counter-external driven current opposite to the plasma current direction in the neoclassical tearing mode (NTM). The equation is used with this model to obtain the modified Rutherford equation with co-current and counter-current contributions. Consistent with the reported experimental results, numerical simulations have shown that the localized counter external current can only partially suppress NTM when it is far from the resonant magnetic surface. Under some circumstances, the Ohkawa mechanism dominated current drive (OKCD) by electron cyclotron waves can concurrently create both co-current and counter-current. In this instance, the minimal electron cyclotron wave power that suppresses a particular NTM was calculated by the Rutherford equation. The result is marginally less than when taking co-current alone into consideration. As a result, to suppress NTM using OKCD, one only needs to align the co-current with a greater OKCD peak well with the resonant magnetic surface. The effect of its lower counter-current does not need to be considered because the location of the counter-current deviates greatly from the resonant magnetic surface.

关键词: driven current, neoclassical tearing mode, modified Rutherford equation, electron cyclotron waves

Abstract: Through theoretical analysis, we construct a physical model that includes the influence of counter-external driven current opposite to the plasma current direction in the neoclassical tearing mode (NTM). The equation is used with this model to obtain the modified Rutherford equation with co-current and counter-current contributions. Consistent with the reported experimental results, numerical simulations have shown that the localized counter external current can only partially suppress NTM when it is far from the resonant magnetic surface. Under some circumstances, the Ohkawa mechanism dominated current drive (OKCD) by electron cyclotron waves can concurrently create both co-current and counter-current. In this instance, the minimal electron cyclotron wave power that suppresses a particular NTM was calculated by the Rutherford equation. The result is marginally less than when taking co-current alone into consideration. As a result, to suppress NTM using OKCD, one only needs to align the co-current with a greater OKCD peak well with the resonant magnetic surface. The effect of its lower counter-current does not need to be considered because the location of the counter-current deviates greatly from the resonant magnetic surface.

Key words: driven current, neoclassical tearing mode, modified Rutherford equation, electron cyclotron waves

中图分类号: (Electromagnetic waves (e.g., electron-cyclotron, Whistler, Bernstein, upper hybrid, lower hybrid))

52.35.Hr

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.))

Qin Gao(高钦) and Ping-Wei Zheng(郑平卫). Effects of counter-current driven by electron cyclotron waves on neoclassical tearing mode suppression[J]. 中国物理B, 2024, 33(5): 55202-055202.

Qin Gao(高钦) and Ping-Wei Zheng(郑平卫). Effects of counter-current driven by electron cyclotron waves on neoclassical tearing mode suppression[J]. Chin. Phys. B, 2024, 33(5): 55202-055202.

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Effects of counter-current driven by electron cyclotron waves on neoclassical tearing mode suppression

Effects of counter-current driven by electron cyclotron waves on neoclassical tearing mode suppression

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