中国物理B ›› 2024, Vol. 33 ›› Issue (6): 65202-065202.doi: 10.1088/1674-1056/ad24d3

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Effects of diamagnetic drift on nonlinear interaction between multi-helicity neoclassical tearing modes

Haiyuan Wang(王海源)1, Shuai Jiang(姜帅)1, Tong Liu(刘桐)1,†, Lai Wei(魏来)1, Qibin Luan(栾其斌)2, and Zheng-Xiong Wang(王正汹)1   

  1. 1 Key Laboratory of Materials Modification by Laser, Ion, and Electron Beams of the Ministry of Education, School of Physics, Dalian University of Technology, Dalian 116024, China;
    2 Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian 116024, China
  • 收稿日期:2023-09-25 修回日期:2024-01-23 接受日期:2024-02-01 出版日期:2024-06-18 发布日期:2024-06-18
  • 通讯作者: Tong Liu E-mail:liutong@dlut.edu.cn
  • 基金资助:
    Project supported by the National Key R&D Program of China (Grant No. 2022YFE03090000), the National Natural Science Foundation of China (Grant Nos. 11925501 and 12075048), and the Fundament Research Funds for the Central Universities (Grant No. DUT22ZD215).

Effects of diamagnetic drift on nonlinear interaction between multi-helicity neoclassical tearing modes

Haiyuan Wang(王海源)1, Shuai Jiang(姜帅)1, Tong Liu(刘桐)1,†, Lai Wei(魏来)1, Qibin Luan(栾其斌)2, and Zheng-Xiong Wang(王正汹)1   

  1. 1 Key Laboratory of Materials Modification by Laser, Ion, and Electron Beams of the Ministry of Education, School of Physics, Dalian University of Technology, Dalian 116024, China;
    2 Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian 116024, China
  • Received:2023-09-25 Revised:2024-01-23 Accepted:2024-02-01 Online:2024-06-18 Published:2024-06-18
  • Contact: Tong Liu E-mail:liutong@dlut.edu.cn
  • Supported by:
    Project supported by the National Key R&D Program of China (Grant No. 2022YFE03090000), the National Natural Science Foundation of China (Grant Nos. 11925501 and 12075048), and the Fundament Research Funds for the Central Universities (Grant No. DUT22ZD215).

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摘要： A numerical study of the diamagnetic drift effect on the nonlinear interaction between multi-helicity neoclassical tearing modes (NTMs) is carried out using a set of four-field equations including two-fluid effects. The results show that, in contrast to the single-fluid case, 5/3 NTM cannot be completely suppressed by 3/2 NTM with diamagnetic drift flow. Both modes exhibit oscillation and coexist in the saturated phase. To better understand the effect of the diamagnetic drift flow on multiple-helicity NTMs, the influence of typical relevant parameters is investigated. It is found that the average saturated magnetic island width increases with increasing bootstrap current fraction $f_{\rm b}$ but decreases with the ion skin depth $\delta $. In addition, as the ratio of parallel to perpendicular transport coefficients $\chi_{\parallel }/\chi_{\bot }$ increases, the average saturated magnetic island widths of the 3/2 and 5/3 NTMs increase. The underlying mechanisms behind these observations are discussed in detail.

关键词: tokamak, two-fluid, neoclassical tearing modes, multi-helicity

Abstract: A numerical study of the diamagnetic drift effect on the nonlinear interaction between multi-helicity neoclassical tearing modes (NTMs) is carried out using a set of four-field equations including two-fluid effects. The results show that, in contrast to the single-fluid case, 5/3 NTM cannot be completely suppressed by 3/2 NTM with diamagnetic drift flow. Both modes exhibit oscillation and coexist in the saturated phase. To better understand the effect of the diamagnetic drift flow on multiple-helicity NTMs, the influence of typical relevant parameters is investigated. It is found that the average saturated magnetic island width increases with increasing bootstrap current fraction $f_{\rm b}$ but decreases with the ion skin depth $\delta $. In addition, as the ratio of parallel to perpendicular transport coefficients $\chi_{\parallel }/\chi_{\bot }$ increases, the average saturated magnetic island widths of the 3/2 and 5/3 NTMs increase. The underlying mechanisms behind these observations are discussed in detail.

Key words: tokamak, two-fluid, neoclassical tearing modes, multi-helicity

中图分类号:  (Tokamaks, spherical tokamaks)

  • 52.55.Fa
52.30.Cv (Magnetohydrodynamics (including electron magnetohydrodynamics)) 52.35.Py (Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.)) 52.55.Tn (Ideal and resistive MHD modes; kinetic modes)