Resonant interaction of tearing modes with energetic-ions resulting in fishbone activities on HL-2A

W Chen, XL Zhu, F Wang, M Jiang, XQ Ji, ZY Qiu… - Nuclear …, 2019 - iopscience.iop.org
W Chen, XL Zhu, F Wang, M Jiang, XQ Ji, ZY Qiu, ZB Shi, DL Yu, YG Li, LM Yu, PW Shi…
Nuclear Fusion, 2019iopscience.iop.org
The resonant interaction between energetic-particles and tearing mode is an unresolved
physics issue at present. It is found for the first time in tokamaks that an unstable tearing
mode with slowly rotating m/n= 2/1 helicity, where m/n represent poloidal/toroidal mode-
numbers, interacts with energetic-ions and results in amplitude-bursting/frequency-chirping
fishbone-like activities. Nonlinear hybrid kinetic-MHD simulations with M3D-K code prove
that the co-passing energetic-ions are responsible for the drive of tearing modes, and the …
Abstract
The resonant interaction between energetic-particles and tearing mode is an unresolved physics issue at present. It is found for the first time in tokamaks that an unstable tearing mode with slowly rotating m/n= 2/1 helicity, where m/n represent poloidal/toroidal mode-numbers, interacts with energetic-ions and results in amplitude-bursting/frequency-chirping fishbone-like activities. Nonlinear hybrid kinetic-MHD simulations with M3D-K code prove that the co-passing energetic-ions are responsible for the drive of tearing modes, and the wave-particle resonance condition is satisfied at, where, and are the toroidal, poloidal angular frequencies of energetic-ions and the mode frequency respectively. These findings can help the understanding of tearing mode induced energetic-particle loss and particle acceleration during the tearing mode reconnection in laboratory and space plasmas.
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