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用动力论和磁流体两个途径研究了低杂波驱动电流(LHCD)对撕裂模不稳定性的影响。线性动力论的结果表明:在碰撞区,由低杂波驱动出的快电子对撕裂模扰动的响应,导致了撕裂模的增长率和扰动层宽度的减小。从对托卡马克条件下低杂波驱动电流的数值模拟及解磁流体撕裂模方程可得出,低杂波驱动电流引起电流分布的变化并使有理面移动,从而导致撕裂模的△＇值的变化。在多数情况下,撕裂模会因低杂波驱动电流而被抑制。但在文中所示的参数下,低杂波驱动电流在较高q_α值的等离子体中对撕裂模起增稳作用;而在较低q_α值的等离子体中有失稳作用。这一结果与实验观测结果定性相符。
The influence of low clutter driving current (LHCD) on the instability of tearing molds is studied by using the theory of momentum and magnetohydrodynamics. The results of the linear dynamical theory show that the response of fast electrons driven by low clutter to the perturbation of the tearing mode in the collision zone leads to the increase of the tearing mode and the decrease of the width of the disturbance zone. From the numerical simulation of the low clutter driving current and the demagnetization fluid tearing mode equation under the condition of tokamak, it can be concluded that the low clutter driving current causes the current distribution to change and the rational plane to move, resulting in △ Change in value. In most cases, the tearing modes are suppressed by the low noise drive current. However, under the parameters shown in the paper, the low-clutter driving current stabilizes the tearing mode in the plasma with higher q_α value, but has instability in the plasma with lower q_α value. This result is qualitatively consistent with the experimental observations.