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Properties of Internal Transport Barrier Formation in JT-60U

机译：JT-60U内部运输屏障形成的性质

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The dependence of the ion thermal diffusivity (χ_i) on the radial electric field (E_r) shear has been investigated in JT-60U plasmas. In positive magnetic shear (PS) plasmas, χ_i in the core region generally increases with the heating power, similar to the L mode at low heating power. However, as a result of the intensive central heating, which is relevant to the enhancement of the E_r shear, a weak internal transport barrier (ITB) is formed, and χ_i in the core region starts to decrease. Corresponding to a further increase of the heating power, a strong ITB is formed and χ_i is reduced substantially. In the case of reversed magnetic shear (RS) plasmas, on the other hand, no power degradation of χ_i is observed in any of the heating regimes. The electron thermal diffusivity (χ_e) is strongly correlated with χ_i in PS and RS plasmas. There exists a threshold in the effective E_r shear to change the state from a weak to a strong ITB. It is found that the threshold of the effective E_r shear in the case of a PS plasma depends on the poloidal magnetic field at the ITB. There are multiple levels of reduced transport in the strong ITB for RS plasmas.
机译：在JT-60U等离子体中研究了离子热扩散率（χ_i）对径向电场（E_R）剪切的依赖性。在正磁剪切（PS）等离子体中，芯区域中的χ_i通常随着加热功率的增加而增加，类似于低加热功率的L模式。然而，由于密集的中央加热，这与E_R剪切的增强相关，形成弱的内部传输屏障（ITB），并且核心区域中的χ_i开始降低。对应于加热功率的进一步增加，形成强ITB，并且基本上减小χ_i。另一方面，在反向磁剪切（RS）等离子体的情况下，在任何加热方案中没有观察到χ_i的功率劣化。电子热扩散率（χ_E）与PS和RS等离子体中的χ_i强烈相关。有效的E_R剪切中存在阈值，以将状态从弱到强ITB更改。发现在PS等离子体的情况下有效E_R剪切的阈值取决于ITB处的针状磁场。对于RS等离子体，强大的ITB中有多种降低的运输。

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