EAST边界准相干模及其对湍流输运影响的模拟研究

边界准相干模在托卡马克高约束运行模式(H模)下的台基普遍存在，但其物理属性及其对湍流输运的影响尚不明确。目前在EAST装置H模放电条件下也观测到多种准相干模，但相关的物理分析非常缺少。本项目将基于回旋动理学程序GEM，采用全域的电磁回旋动理学模拟方法，并结合EAST典型H模放电参数，利用最近发展完善的接口模块直接读取实验磁平衡和剖面数据，对边界准相干模及其对湍流输运的影响开展数值模拟研究。首先通过线性模拟研究边界准相干模产生的物理机制及其本质特征，分析影响边界准相干模的频率和增长率等模结构特征的关键物理参数。然后通过非线性模拟研究边界准相干模的饱和机制及其对湍流输运的影响。本研究不仅有助于正确理解边界准相干模的模结构特征及其对湍流输运的影响，同时也可以为之后的EAST实验和优化分析提供参考。

The edge quasi coherent modes are ubiquitous in tokamak high confinement mode (H mode) pedestal, but their physical properties and effects on turbulent transport are not clear. At present, many quasi coherent modes have been observed under the condition of H-mode discharge in EAST device, but the relevant physical analysis is very scarce. In this project, based on the gyrokinetic code GEM, the global electromagnetic gyrokinetic simulation method is adopted, combined with the typical H-mode discharge parameters of EAST, and the recently developed interface module is used to directly read the experimental magnetic equilibrium and profiles data, so as to carry out the numerical simulation research on the edge quasi coherent mode and its influence on turbulent transport. Firstly, the physical mechanism and essential characteristics of the generation of edge quasi coherent modes are studied by linear simulation, and the key physical parameters affecting the mode structure characteristics such as frequency and growth rate of edge quasi coherent modes are analyzed. Then the saturation mechanism of edge quasi coherent modes and its influence on turbulent transport are studied by nonlinear simulation. This study not only helps to understand the mode structure characteristics of edge quasi coherent modes and their effects on turbulent transport, but also provides a reference for future EAST experiments and optimization analysis.