先进托卡马克构型中最小q诱导的恶魔模与EP驱动模之间的交替
Minimum-q induced alternation between infernal modes and EP-driven modes in advanced tokamak configurations
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中文总结 AI 辅助
该研究针对含高能粒子的先进托卡马克构型，发现最小安全因子q_min变化会使主导不稳定性在反向剪切阿尔文本征模、高能粒子模与恶魔模间交替，且高能粒子beta分数会影响各模式稳定性，揭示了相关粒子驱动机制。
中文摘要 AI 辅助
对于存在高能粒子（EPs）的先进托卡马克构型，研究发现主导不稳定性会随最小安全因子q_min的变化，在恶魔模与阿尔文本征模之间交替。当q_min相对较高时，该模式被识别为反向剪切阿尔文本征模（RSAE），其特征为有限的阿尔文频率，且径向定位于安全因子剖面最小值附近。随着q_min进一步降低，主导分支依次经过低频恶魔模区间、高能粒子模（EPM） regime，最终进入另一个低频恶魔模区间。增大EP的beta分数β_h会使RSAE和EPM分支失稳，但会使恶魔模稳定。相空间诊断进一步表明，EPs对RSAE和EPM分支的失稳效应主要与捕获粒子驱动相关，而EPs对恶魔模的稳定效应则由通行粒子主导。
英文摘要
For an advanced tokamak configuration in the presence of energetic particles (EPs), the dominant instability is found to alternate between infernal modes and Alfvén eigenmodes with the variation of the minimum safety factor $q_{\min}$. For relatively high $q_{\min}$, the mode is identified as a reversed-shear Alfvén eigenmode (RSAE), characterized by its finite Alfvénic frequency and radial localization near the minimum of safety-factor profile. As $q_{\min}$ is further reduced, the dominant branch sequentially transitions through a low-frequency infernal-mode interval, then an energetic-particle-mode (EPM) regime, and finally another low-frequency infernal-mode interval. Increasing the EP beta fraction $β_h$ tends to destabilize the RSAE and EPM branches but to stabilize the infernal modes. Phase-space diagnostics further indicate that the destabilizing effects of EPs on the RSAE and EPM branches are mainly associated with trapped-particle drive, whereas the stabilizing effects of EPs on the infernal modes is dominated by passing particles.
