Based on the non-perturbative approach, the hybrid code MARS-K is applied to study fishbone (FB) instabilities driven by trapped fast ions in a toroidal plasma with q profile nearly being flat or non-monotonic. We explore the dependency of the FB with variation in the fast ion distribution, thermal particle kinetic effects, safety factor ( q ) profile and plasma resistivity. When the safety factor minimum value is larger than unity (i.e. ##IMG## [http://ej.iop.org/images/0029-5515/60/9/096022/nfaba1ceieqn1.gif] {$q_{\mathrm{min}}\gt 1$} ), the mode can be excited by isotropic or anisotropic fast ions, with the latter strongly enhancing the mode growth rate. The mode frequency increases with increasing ##IMG## [http://ej.iop.org/images/0029-5515/60/9/096022/nfaba1ceieqn2.gif] {$q_{\mathrm{min}}$} , and is more easily triggered in a equilibrium with two q = 1 surfaces, compared with the case with one or no q = 1 s...

中文翻译：

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反向磁切变在环形等离子体中捕获快速离子驱动的鱼骨不稳定性

基于非微扰方法，将混合代码MARS-K用于研究由q轮廓几乎为平坦或非单调的环形等离子体中捕获的快离子驱动的鱼骨（FB）不稳定性。我们探索了快速离子分布，热粒子动力学效应，安全系数（q）分布和等离子体电阻率变化对FB的依赖性。当安全系数最小值大于1时（即## IMG ## [http://ej.iop.org/images/0029-5515/60/9/096022/nfaba1ceieqn1.gif] {$ q _ {\ mathrm {min}} \ gt 1 $}），该模式可以由各向同性或各向异性的快离子激发，后者使模式增长速率大大提高。模式频率随着## IMG ##的增加而增加[http://ej.iop.org/images/0029-5515/60/9/096022/nfaba1ceieqn2.gif] {$ q _ {\ mathrm {min}} $} ，