Interactions between energetic particles (EPs) and neoclassical tearing mode (NTM) islands in the DIII-D tokamak are studied using the global gyrokinetic toroidal code (GTC). GTC simulations find that the EP radial profile is partially flattened within the magnetic island regions and that there are stochastic regions in the particle phase space. Radial particle flux is induced mainly around the magnetic island regions and decreases with time to almost zero when the initial EP distribution achieves a new steady-state in the absence of EP sources. Stochastic regions of magnetic field lines induced by the superposition of multiple islands have weak effects on the particle flux when the width of stochastic regions is smaller than the EP drift orbit width. The perturbed parallel EP current induced by the magnetic islands has weak stabilizing effects on the linear growth rate of the NTM instability in this DIII-D experiment.

中文翻译：

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由新古典撕裂模式引起的高能粒子与磁岛之间相互作用的陀螺动力学粒子模拟

使用全局陀螺动力学环形代码 (GTC) 研究了 DIII-D 托卡马克中高能粒子 (EP) 和新古典撕裂模式 (NTM) 岛之间的相互作用。GTC 模拟发现 EP 径向轮廓在磁岛区域内部分变平，并且在粒子相空间中存在随机区域。径向粒子通量主要在磁岛区域周围感应，并且当初始 EP 分布在没有 EP 源的情况下达到新的稳态时，它会随时间降低到几乎为零。当随机区的宽度小于EP漂移轨道宽度时，由多个岛叠加引起的磁力线随机区对粒子通量的影响较弱。