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Properties of internal transport barrier formation in JT-60U

机译：JT-60U内部运输壁垒形成的特性

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The dependence of the thermal diffusivity on the heat flux has been investigated in JT-60U plasmas by varying the neutral beam power. In positive magnetic shear (PS) plasmas, the ion thermal diffusivity (X{sub}i) in the core region generally increases with the heating power, as with the L mode at low heating powers. However, as a result of the intensive central heating, a weak internal transport barrier (ITB) is formed, and the X{sub}i value in the core region starts to decrease. Corresponding to a further increase in the heating power, a strong ITB is formed and the X{sub}i value is reduced substantially. In the case of reversed magnetic shear (RS) plasmas, on the other hand, no power degradation of the X{sub}i value is observed in any of the heating regimes. The electron thermal diffusivity (X{sub}e) is correlated with the X{sub}i value in PS and RS plasmas. Furthermore, the dependence of the ion thermal diffusivity on the radial electric field (E{sub}r) shear has also been investigated. By considering the non-locality in the relation between the E{sub}r shear and the X{sub}i value, a threshold in the effective E{sub}r shear to change the state from a weak to a strong ITB is identified.
机译：通过改变中性束功率，已经研究了JT-60U等离子体中热扩散率对热通量的依赖性。在正磁剪切（PS）等离子体中，核心区域中的离子热扩散率（X {sub} i）通常随加热功率而增加，就像在低加热功率下的L模式一样。然而，由于集中的集中加热的结果，形成了弱的内部传输势垒（ITB），并且核心区域中的X {i} i值开始减小。对应于加热功率的进一步增加，形成了坚固的ITB并且X {sub} i值大大降低。另一方面，在反向磁剪切（RS）等离子体的情况下，在任何加热方式下均未观察到X {i} i值的功率下降。在PS和RS等离子体中，电子热扩散率（X {sub} e）与X {sub} i值相关。此外，还研究了离子热扩散率对径向电场（E {sub} r）剪切的依赖性。通过考虑E {r} r剪切与X {sub} i值之间关系的非局部性，确定了有效E {r} r剪切以将状态从弱ITB变为强ITB的阈值。

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