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Relationship between particle and heat transport in JT-60U plasmas with internal transport barrier

机译：JT-60U等离子体中粒子和热传输与内部运输屏障的关系

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The relationship between particle and heat transport in an internal transport barrier (ITB) has been systematically investigated in reversed shear (RS) and high β_p ELMy H-mode plasmas in JT-60U. No helium and carbon accumulation inside the ITB is observed even with ion heat transport reduced to a neoclassical level. On the other hand, the heavy impurity argon is accumulated inside the ITB. The argon density profile estimated from the soft x-ray profile is more peaked, by a factor of 2-4 in the RS plasma and of 1.6 in the high β_p mode plasma, than the electron density profile. The helium diffusivity (D_(He)) and the ion thermal diffusivity (χ_i) are at an anomalous level in the high β_p mode plasma, where D_(He) and χ_i are higher by a factor of 5-10 than the neoclassical value. In the RS plasma, D_(He) is reduced from the anomalous to the neoclassical level, together with χ_i. The carbon and argon density profiles calculated using the transport coefficients reduced to the neoclassical level only in the ITB are more peaked than the measured profiles, even when χ_i is reduced to the neoclassical level. Argon exhaust from the inside of the ITB is demonstrated by applying ECH in the high β_p mode plasma, where both electron and argon density profiles become flatter. The reduction of the neoclassical inward velocity for argon due to the reduction of density gradient is consistent with the experimental observation. In the RS plasma, the density gradient is not decreased by ECH and argon is not exhausted. These results suggest the importance of density gradient control to suppress heavy impurity accumulation.
机译：在JT-60U中，在反向剪切（RS）和高β_PElmy H模式等离子体中系统地研究了内部传输屏障（ITB）中的粒子和热传输之间的关系。即使使用ITB内部没有氦气和碳积累，即使离子热传输还原到新古典水平。另一方面，沉重的杂质氩气累积在ITB内。从软X射线曲线估计的氩密度分布更峰，在RS等离子体中的RS等离子体中的2-4倍，并且在高β_P模式等离子体中为1.6，而不是电子密度曲线。氦扩散率（D_（HE））和离子热扩散率（χ_i）处于高β_P模式等离子体中的异常水平，其中D_（HE）和χ_i比新古典价值更高为5-10。在RS等离子体中，D_（HE）从异常到新古典水平降低，以及χ_i。使用传输系数计算的碳和氩密度型材仅在ITB中减少到新古典水平的比测量的轮廓更峰，即使当χ_i被减少到新古典水平时也是如此。通过在高β_P模式等离子体中施加ech，证明来自ITB内部的氩气排气，其中电子和氩密度型材都变得更平坦。由于密度梯度的降低而导致氩气的新古典向内速度的降低与实验观察一致。在RS等离子体中，eqh和氩不耗尽密度梯度不会降低。这些结果表明密度梯度控制抑制重杂质积累的重要性。

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