The dependence of fishbone cycle on energetic particle intensity has been investigated in EAST low-magnetic-shear plasmas. It is observed that the fishbone mode growth rate, saturation amplitude as well as fishbone cycle frequency clearly increase with increasing neutral beam injection (NBI) power. Moreover, enhanced electron density and temperature perturbations as well as energetic particle loss were observed with greater injected NBI power. Simulation results using M3D-K code show that as the NBI power increases, the resonant frequency and the energy of the resonant particles become higher, and the saturation amplitude of the mode also changes, due to the non-perturbative energetic particle contribution. The relationship between the calculated energetic particle pressure ratio and fishbone cycle frequency is obtained as ${f_{\textrm{FC}}} = 2.2{(1000{\beta _{\textrm{ep,calc}}} - 0.1)^{5.9 \pm 0.5}}$ . Results consistent with the experimental observations have been achieved based on a predator–prey model.

中文翻译：

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鱼骨循环对 EAST 低磁剪切等离子体中高能粒子强度的依赖性

在 EAST 低磁剪切等离子体中研究了鱼骨循环对高能粒子强度的依赖性。可以观察到，随着中性束注入 (NBI) 功率的增加，鱼骨模式增长率、饱和幅度以及鱼骨循环频率明显增加。此外，随着注入 NBI 功率的增加，观察到电子密度和温度扰动以及高能粒子损失的增加。使用 M3D-K 代码的仿真结果表明，随着 NBI 功率的增加，由于非微扰高能粒子的贡献，谐振频率和谐振粒子的能量变得更高，并且模式的饱和幅度也发生了变化。计算得到的高能粒子压力比与鱼骨循环频率的关系为 ${f_{\textrm{FC}}} = 2.2{(1000{\beta _{\textrm{ep,calc}}} - 0.1)^{5.9 \pm 0.5}}$ . 基于捕食者 - 猎物模型，已获得与实验观察一致的结果。