A model is proposed for the edge harmonic oscillation, in which the stationary coherent mode is sustained in the almost linear phase as has been observed in JT-60U. We study the coupled dynamics of the peeling mode amplitude and edge pressure gradient. The limit cycle oscillation is predicted. The peeling mode (which is almost in the linear phase) is in a dynamical stationary state with amplitude modulation. In this model, the time scales for the change of parameters that specify magnetic structures (such as magnetic shear and edge plasma current) are assumed to be much slower, so that are decoupled from the limit cycle dynamics. The condition that the limit cycle state appears is shown. The oscillation frequency of the modulation is given by the hybrid mean of the typical growth rate of the peeling mode and the additional loss rate of pressure gradient by the peeling mode.

提出了一种用于边缘谐波振荡的模型，其中在JT-60U中已经观察到，在几乎线性的相位中保持了固定相干模式。我们研究了剥离模式振幅和边缘压力梯度的耦合动力学。极限循环振荡被预测。剥离模式（几乎处于线性相位）处于具有振幅调制的动态平稳状态。在该模型中，用于指定磁性结构（例如磁剪切和边缘等离子体电流）的参数变化的时间尺度被认为要慢得多，从而与极限循环动力学脱钩。显示极限循环状态出现的条件。