Frequency chirping of neoclassical tearing modes by energetic ions

被引：5
作者：
Cai, Huishan [1 ]
机构：
[1] Univ Sci & Technol China, Sch Nucl Sci & Technol, CAS Key Lab Geospace Environm, Hefei 230026, Peoples R China
来源：
NUCLEAR FUSION | 2021年 / 61卷 / 12期
基金：
国家重点研发计划; 中国国家自然科学基金;
关键词：
neoclassical tearing modes; energetic ions; frequency chirping; magnetic island; MAGNETIC ISLANDS; LIMITS;
D O I：
10.1088/1741-4326/ac2b77
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
The mechanism of rapid frequency chirping for neoclassical tearing modes (NTMs) is studied. Resonance between NTMs and trapped energetic ions can provide an additional torque to change the evolution of frequency. Whether the frequency rises or falls depends on the direction of island propagation. If the island propagates in the direction of ion diamagnetic drift, the frequency will be increased dramatically and rapidly. If the island propagates in the direction of electron diamagnetic drift, the frequency will be reduced to a lower value. The predicted chirping time is consistent with experimental results in DIII-D (Liu et al 2020 Nucl. Fusion 60 112009).
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页数：5
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