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H-mode and transport barriers in helical systems

机译：螺旋系统中的H型和传输壁垒

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This paper presents the physics of two bifurcations in confinement of helical devices-(1) to the H-mode and (2) to internal transport barrier (ITB)-like electron temperature profiles as they develop under neoclassical electron root conditions in 3-dimensional systems. With their characteristics-low or negative magnetic shear, strong toroidal flow damping, experimental variability of poloidal flow damping, radial electric field enforced by ambipolarity, diagnostic access to sophisticated spatial and temporal structures of turbulence thanks to low-power operation with external confinement-helical devices provide unique contributions to the physics of transport barriers. The bifurcation to confinement with external transport barrier seems to be soft and the leading role of the electric field gradient is confirmed; the one to ITB-like core profiles is a hard transition and it is the electric field which governs it. The paper summarizes the status of H-mode research in helical systems and discusses the impact of the electron root on core confinement.
机译：本文介绍了两个分叉的局限在螺旋器件中的物理原理-（1）呈H型和（2）呈内部输运势垒（ITB）状的电子温度曲线，因为它们在3维新古典电子根条件下发展系统。具有低或负磁剪切力，强环形流量阻尼，极向流量阻尼的实验可变性，由双极性强制施加的径向电场，借助低功率运行和外部约束螺旋线可对复杂的时空结构进行诊断访问的特性设备为运输障碍的物理特性做出了独特的贡献。限制与外部输运势垒的分叉似乎很软，并且证实了电场梯度的主导作用。一个类似于ITB的核心配置文件是一个艰巨的过渡，而电场是控制它的。本文总结了H模式在螺旋系统中的研究现状，并讨论了电子根对纤芯限制的影响。

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