Frequency chirping of neoclassical tearing modes by energetic ions

Nuclear Fushion

article

Huishan Cai¹ 

[1] CAS Key Laboratory of Geospace Environment, School of Nuclear Sciences and Technology, University of Science and Technology of China

关键词: neoclassical tearing modes;    energetic ions;    frequency chirping;    magnetic island;   

DOI  :  10.1088/1741-4326/ac2b77

来源: Institute of Physics Publishing Ltd.

【 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 (Liuet al2020Nucl. Fusion60112009).

【 授权许可】

Unknown