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研究了电漂移对通行高能离子与新经典撕裂模(NTM)共振相互作用的影响。利用漂移动力论方法,在求解共振相互作用产生的作用在磁岛上的环向力矩的过程中重新考虑了电漂移的作用。结果表明,在与磁岛运动相关的环向动量平衡中v>0的通行高能离子与v<0的通行高能离子作用恰好相反,当磁岛沿电子抗磁漂移方向传播时,前者趋向于使磁岛传播频率减小,后者趋向于使磁岛传播频率增大,通行高能离子产生的总的环向力矩几乎为零。仅将v>0的通行高能离子所产生的环向力矩带入由环向动量平衡方程和修正的卢瑟福方程所组成的方程组中,数值计算结果表明,描述磁岛旋转频率与宽度随时间做非线性振荡的稳定极限环并不存在。

The effect of the electric drift upon the resonant interaction between energetic ions and neoclassical tearing modes

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.