AbstractNumerical analysis of the island width of the neoclassical tearing mode, which is induced by the helical bootstrap current along the island, have been carried out to clarify effects of profiles on stability and to obtain conditions for stabilization by electron cyclotron current drive (ECCD). When the neoclassical tearing mode emerges, the saturated island grows up to some 10% of the minor radius at the beta value well below the ideal kink limit. The saturated island width of m/n mode can be small when the magnetic shear is large and the pressure gradient is low at the corresponding rational surface. Therefore, in the broad pressure and high li (internal inductance) plasma, the neoclassical tearing mode is more stable when qmin is slightly above one or two. In the broad pressure and low li plasma, the dependence of the island width on q0 is weak. A localized additional current at the O-point of the island by the ECCD significantly stabilizes the mode. The localization of the external current is effective, however, the stabilization also works well when the island width is smaller the radial width of the local current. The required current for the stabilization does not depend on the profiles very much.
新古典撕裂模的岛宽数值分析，该模由沿岛螺旋自举电流所诱导，已开展以阐明轮廓对稳定性的影响，并获取通过电子回旋电流驱动（ECCD）实现稳定的条件。当新古典撕裂模出现时，在远低于理想扭曲极限的β值下，饱和岛增长至小半径的约10%。当磁剪切较大且对应有理面处压力梯度较低时，m/n模的饱和岛宽可以较小。因此，在宽压力轮廓和高li（内部电感）等离子体中，当qmin略高于1或2时，新古典撕裂模更为稳定。在宽压力轮廓和低li等离子体中，岛宽对q0的依赖性较弱。通过ECCD在O点进行局域附加电流注入可显著稳定该模。局域化电流注入是有效的，然而，当岛宽小于局域电流的径向宽度时，稳定化效果同样良好。所需稳定化电流对轮廓的依赖性不大。