Non-resonant fishbone instabilities of qmin ≳ 1 in tokamak plasmas with weakly reversed magnetic shear

被引：18

作者：

Wang, Xian-Qu ^{[1
]}

Zhang, Rui-Bin ^{[1
]}

Qin, Liang ^{[1
]}

Wang, Xiao-Gang ^{[1
]}

机构：

[1] Peking Univ, Sch Phys, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2014年 / 56卷 / 09期

关键词：

reversed magnetic shear; non-resonant fishbone; fast particles; INTERNAL KINK MODE; ENERGETIC TRAPPED-PARTICLES; TOROIDAL GEOMETRY; STABILITY; IDEAL; IONS; JET;

D O I：

10.1088/0741-3335/56/9/095013

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

In this study, we theoretically explore properties of non-resonant fishbone (NRF) instabilities with a safety factor profile slightly above unity (q(min) greater than or similar to 1) in tokamak plasmas with reversed magnetic shear configuration. From the dispersion relation of the NRF mode, it is found that the growth rate of the mode in general reversed shear scenarios with q(min) greater than or similar to 1 depends on fast ion beta beta(h) in a power law of similar to beta(2/3)(h) h, different from that of similar to beta(h) in a conventional positive magnetic shear configuration. Meanwhile, due to the slow ion precession and small continuum damping in ITER-like tokamaks with reversed shear, the mode has a lower trigger threshold than those with monotonously positive magnetic shear. In addition, the ion diamagnetic drift has been found to destabilize the fast ion-driven NRF mode. Other effects such as the shape of the q-profile, characterized by values of q(min) and q(0), neutral beam energy, magnetohydrodynamic potential energy and the fraction of fast ions on the instability threshold are also discussed. Nonlinear behavior of the mode is further analyzed using a modified model.

引用

页数：7

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