The dominant two-fluid magnetohydrodynamic (MHD) stabilities of China Fusion Engineering Test Reactor upgrade phase-I baseline equilibria in presence of perfect conducting wall have been evaluated using the initial value code NIMROD. Our MHD simulations show that for equilibrium with qaxis < 1, high-n edge localized modes are slightly stabilized by toroidal shear flow, and n = 1 mode is found to be unstable in the core region with the characteristic of sawtooth instability. For qaxis > 2 equilibrium, all modes are found to be unstable but edge localized both in single-fluid and two-fluid MHD models. Specifically for n ≤ 13 modes, the two-fluid MHD model gives a slightly higher growth rate than the single-fluid MHD model, while for n > 13 modes, this trend becomes the opposite, which means the two-fluid MHD model is needed for high-n mode analysis. In addition, n = 1–10 modes are found to be more unstable with increasing wall position and eventually their growth rates approach values in the no-wall limit.
中国核聚变工程实验堆升级版第一阶段平衡态在理想导体壁存在下的磁流体动力学稳定性，已使用初值程序NIMROD进行了评估。我们的磁流体动力学模拟表明，对于q轴小于1的平衡态，高环向模数边缘局域模被环形剪切流轻微稳定化，而n=1模则在芯部区域表现出不稳定性，其特征与锯齿振荡不稳定性相符。对于q轴大于2的平衡态，所有模数均表现为不稳定性，且在单流体和双流体磁流体动力学模型中均呈边缘局域化特征。具体而言，对于n≤13的模数，双流体磁流体动力学模型给出的增长率略高于单流体模型；而对于n>13的模数，这一趋势发生反转，表明在高n模分析中需要考虑双流体效应。此外，随着理想导体壁位置向外移动，n=1–10模的不稳定性增强，其增长率最终趋近于无壁极限值。