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_(b) but decreases with the ion skin depth δ.In addition,as the ratio of parallel to perpendicular transport coefficients χ_(‖)/χ_(⊥) 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.
作者
王海源
姜帅
刘桐
魏来
栾其斌
王正汹
Haiyuan Wang;Shuai Jiang;Tong Liu;Lai Wei;Qibin Luan;Zheng-Xiong Wang(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;Faculty of Electronic Information and Electrical Engineering,Dalian University of Technology,Dalian 116024,China)
基金
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)
the Fundament Research Funds for the Central Universities (Grant No. DUT22ZD215)。
