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Locking of neoclassical tearing modes by error fields and its stabilization by RF current

机译：通过误差场锁定新古典撕裂模式，并通过射频电流对其进行稳定

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摘要

The locking of neoclassical tearing modes (NTMs) by error fields is studied numerically. In the regime with low mode frequency and large plasma viscosity, the required field amplitude for mode locking is found to be proportional to the plasma viscosity and the mode frequency but inversely proportional to the square of the magnetic island width and the Alfven velocity, being similar to that of the classical tearing mode. This indicates that NTMs will be locked to low amplitude error fields in a fusion reactor. The stabilization of NTMs by RF current in the presence of a static helical field is therefore further investigated. The applied helical field allows one to control the location of the island's o-point to be in the RF wave deposition region, to enable the NTM stabilization by RF current after mode locking. When the island is large enough to be locked by a small amplitude helical field in the desired phase, the island is reduced to a smaller width by RF current compared with the case without the helical field. This suggests a possible way to enhance the stabilization of NTMs by RF current.
机译：数值研究了误差场对新古典撕裂模式（NTM）的锁定。在低模频率和大等离子体粘度的状态下，发现锁模所需的场振幅与等离子体粘度和模频率成正比，但与磁岛宽度和Alfven速度的平方成反比，相似到传统的撕裂模式这表明NTM将被锁定在聚变反应堆中的低振幅误差场上。因此，将进一步研究存在静态螺旋场时通过RF电流对NTM的稳定性。施加的螺旋场允许控制岛的o点的位置在RF波沉积区域中，从而在锁模后通过RF电流实现NTM稳定化。当岛大到足以被期望相位中的小幅度螺旋场锁定时，与没有螺旋场的情况相比，岛被射频电流减小到更小的宽度。这暗示了一种通过射频电流来增强NTM稳定性的可能方法。

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