Speaker
Haijun Ren
(University of Science and Technology of China)
Description
In this work, we analytically investigate energetic particle-driven geodesic acoustic modes (EGAMs) by considering non-circular cross-sections of tokamaks. In the framework of the gyro-kinetic equation, we find that shaping effects can introduce additional energetic particle-wave resonance points at $\omega = n \omega_t^h \left( n = 2, 3, 4 \right)$, where $\omega$ and $\omega_t^h$ are EGAM frequency and transit frequency of energetic particle. Our results show that these additional resonances provide a bridge for energy transfer between energetic particles and the high-frequency branch of EGAMs, which leads to the instability of the high-frequency branch of EGAMs.
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Authors
Mr
Zhe Chen
(University of Science and Technology of China)
Haijun Ren
(University of Science and Technology of China)
