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

doi:10.1088/1674-1056/ad24d3

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.

Keywords: tokamak two-fluid neoclassical tearing modes multi-helicity

Received: 25 September 2023
Revised: 23 January 2024
Accepted manuscript online: 01 February 2024

PACS:	52.55.Fa	(Tokamaks, spherical tokamaks)
	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)

Fund: 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).

Corresponding Authors: Tong Liu
E-mail: liutong@dlut.edu.cn

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Haiyuan Wang(王海源), Shuai Jiang(姜帅), Tong Liu(刘桐), Lai Wei(魏来), Qibin Luan(栾其斌), and Zheng-Xiong Wang(王正汹) Effects of diamagnetic drift on nonlinear interaction between multi-helicity neoclassical tearing modes 2024 Chin. Phys. B 33 065202

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

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