Forschungszentrum Jülich GmbH, IEF4-Plasma Physics, 52428 Jülich, Germany.
Phys Rev Lett. 2009 Oct 16;103(16):165005. doi: 10.1103/PhysRevLett.103.165005.
Good alignment of the magnetic field line pitch angle with the mode structure of an external resonant magnetic perturbation (RMP) field is shown to induce modulation of the pedestal electron pressure p(e) in high confinement high rotation plasmas at the DIII-D tokamak with a shape similar to ITER, the next step tokamak experiment. This is caused by an edge safety factor q95 resonant enhancement of the thermal transport, while in contrast, the RMP induced particle pump out does not show a significant resonance. The measured p(e) reduction correlates to an increase in the modeled stochastic layer width during pitch angle variations matching results from resistive low rotation plasmas at the TEXTOR tokamak. These findings suggest a field line pitch angle resonant formation of a stochastic magnetic edge layer as an explanation for the q95 resonant character of type-I edge localized mode suppression by RMPs.
研究表明，在外加共振磁场扰动（RMP）场的模式结构中，磁场线螺旋角的良好对准会导致 DIII-D 托卡马克高约束高旋转等离子体中基顶电子压力 p(e)的调制，该托卡马克的形状类似于 ITER，即下一步的托卡马克实验。这是由边缘安全系数 q95 对热输运的共振增强引起的，而相比之下，RMP 诱导的粒子抽出并没有显示出明显的共振。在与 TEXTOR 托卡马克低旋转等离子体的电阻结果相匹配的螺旋角变化期间，测量到的 p(e)降低与模型中随机层宽度的增加相关，这表明作为 RMP 抑制 I 型边缘局域模的 q95 共振特征的一种解释，磁场线螺旋角共振形成了随机磁边缘层。
