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Comparison of electron internal transport barriers in the large helical device and JT-60U plasmas

机译：大型螺旋装置和JT-60U等离子体中电子内部传输壁垒的比较

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摘要

Plasmas with an electron internal transport barrier (ITB), which is characterized by peaked electron temperature profiles, are obtained in the JT-60U tokamak and in the large helical device (LHD) when the electron cyclotron heating (ECH) is focused on the magnetic axis. The maximum values of R/L-Te, where R is the major radius and LT. is the scale length of the electron temperature gradient, are similar for the LHD and JT-60U ITB plasmas. However, there is a clear jump of R/L-Te observed in LHD but not in JT-60U in the ECH power scan. This result is consistent with the fact that the trigger mechanism of the electron ITB is the fast transition of the radial electric field from a small negative E, to a large positive E, in LHD and a change of the magnetic shear from positive to negative is required for the formation of the electron ITB in JT-60U. There are also differences in the electron temperature profiles inside the ITB. The flattening of the electron temperature profile inside the strong ITB could be explained by the sharp increase of q values observed in JT-60U, while no flattening of the electron temperature profile is observed in LHD, where the central q values stay low.
机译：当电子回旋加速器加热（ECH）集中在磁场时，在JT-60U托卡马克和大型螺旋装置（LHD）中获得具有电子内部传输势垒（ITB）的等离子体，其特征在于峰值电子温度曲线。轴。 R / L-Te的最大值，其中R是主半径，而LT。是电子温度梯度的标度长度，与LHD和JT-60U ITB等离子体相似。但是，在EHD功率扫描中，在LHD中观察到R / L-Te明显跳升，而在JT-60U中观察不到。该结果与以下事实相符，即电子ITB的触发机制是径向电场在LHD中从小的负E到大的正E的快速跃迁，并且磁剪切从正变为负。在JT-60U中形成电子ITB所需的材料。 ITB内部的电子温度曲线也存在差异。 JT-60U中观察到的q值急剧增加，可以解释强ITB内部电子温度分布的平坦化，而在中心Q值保持较低的LHD中，没有观察到电子温度分布的平坦化。

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