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Effects of Plasma Diamagnetic Drift on Alfvén Continua and Discrete Eigenmodes in Tokamaks
Journal of Fusion Energy ( IF 1.1 ) Pub Date : 2021-01-06 , DOI: 10.1007/s10894-020-00275-0
J. Bao , W. L. Zhang , D. Li , Z. Lin

Alfvén continua and Alfvén eigenmodes (AEs) in DIII-D plasmas (shot #142111) have been studied using a drift-MHD model with self-consistent plasma diamagnetic drift effects. It is shown that the $$\omega _*$$ ω ∗ causes the frequency upshift in ion diamagnetic drift direction for both Alfvén continua and AEs and thus breaks the ion-electron symmetry of the ideal-MHD model results. The BAE gaps are more sensitive to the $$\omega _*$$ ω ∗ modification compared to the TAE gaps located in a higher frequency range. After comparing with self-consistent results, an approximate solution of Alfvén continua with $$\omega _*$$ ω ∗ effect is given with high accuracy. The eigenmode structure of TAE is less influenced by $$\omega _*$$ ω ∗ effect compared to the real frequency. The incorporation of the diamagnetic drift effects of the background plasmas and energetic particles (EPs) is important to validate theoretical and simulation models against experiments, i.e., correctly address the continuum and radiative dampings as well as AE resonance condition with EPs.

中文翻译:

等离子体抗磁漂移对托卡马克中阿尔文连续体和离散本征模式的影响

已经使用具有自洽等离子体抗磁漂移效应的漂移-MHD 模型研究了 DIII-D 等离子体(镜头 #142111)中的阿尔文连续体和阿尔文本征模式 (AE)。结果表明,$$\omega _*$$ ω ∗ 导致 Alfvén 连续体和 AE 的离子抗磁漂移方向的频率上移,从而破坏了理想 MHD 模型结果的离子电子对称性。与位于较高频率范围内的 TAE 间隙相比,BAE 间隙对 $$\omega _*$$ ω ∗ 修改更敏感。与自洽结果进行比较后,高精度地给出了具有$$\omega _*$$ ω ∗ 效应的Alfvén continua 的近似解。与实际频率相比,TAE 的本征模结构受 $$\omega _*$$ ω ∗ 效应的影响较小。
更新日期:2021-01-06
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