关键词: 共振相互作用, 通行高能离子, 新经典撕裂模, 漂移动力论方法, 电漂移

Abstract:

The effect of the electric drift upon the resonant interaction of passing energetic ions with neoclassical tearing mode (NTM) has been studied. Using a drift-kinetic approach, we reconsider the role of the electric drift and obtain the toroidal torque exerting on island produced by the resonant interaction. We find that, according to the net balance of toroidal momentum associated with the magnetic island motion, the passing energetic ions with v >0 tend to reduce the mode frequency when the magnetic island moves along the electron diamagnetic drift direction, on the opposite, the ones with v<0 tend to increase the mode frequency, the total toroidal torque produced by them is almost zero. In the following calculation, only the torque produced by the passing energetic ions with v>0 has been included in the coupled equations which consist of the net balance of toroidal momentum equation associated with the magnetic island motion and the modified Rutherford equation. Numerical calculation show that the stable limit cycle describing nonlinear oscillations of the mode frequency and amplitude dose not exit.

Key words: Resonant interaction, Passing energetic ions, Neoclassical tearing mode, Drift-kinetic approach, Electric drift