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Edge issues in ITB plasmas in JET

机译：JET中ITB等离子体的边缘问题

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This paper documents critical issues in internal transport barrier (ITB) plasmas in JET, namely the transition from type III to type I edge localized modes (ELMs), and the subsequent impact of. large amplitude ELMs on the ITB. Benign type III ELMs are observed in ITB plasmas at input powers much larger (up to a factor 3) than the empirical threshold for type III/I transition derived from standard H-modes. Various measurements indirectly suggest a, larger fraction of plasma current at the edge of ITB plasmas. Experimental results look consistent with a type III ELM regime controlled by a large fraction of edge current. Especially, the transition to type I ELMS does not occur for a broad current profile (l(i) approximate to 0.78) characterized by-low edge magnetic shear (S-95 approximate to 2.6), and a back transit I ion from type I to typed III has been found to well correlate with an increase of the edge, current. When large ELMs occur, strong perturbations deltaT(e) on electron temperature are generated, and propagate inwards on a ballistic timescales, at nu(burst) 160 m s(-1). It is of the. order of one third (respectively one ninth) of the curvature (respectively diamagnetic) drift. This propagation looks reminiscent of non-local transport experiments. The perturbation induced-by large ELMs can reach the ITB. In this case, deltaT(e) increases in the vicinity of the ITB before being strongly damped further inside. Such ELMs also lead to a transient increase- of T, gradient at the ITB, which then moves inwards on a diffusive timescale (chi approximate to 3 x 10(-2) m(2) s(-1)) while degrading. [References: 62]
机译：本文记录了JET内部运输障碍（ITB）等离子体中的关键问题，即从III型向I型边缘局域模（ELM）的过渡及其后续影响。 ITB上的大幅度ELM。在ITB等离子体中观察到良性III型ELM，其输入功率比标准H模式得出的III / I型转变的经验阈值大得多（高达3倍）。各种测量结果间接表明，ITB等离子体边缘的等离子体电流比例更大。实验结果看起来与由很大一部分边缘电流控制的III型ELM机制一致。尤其是，对于以低边缘磁剪切（S-95约为2.6）为特征的宽电流曲线（I（i）约为0.78）和I型的反向离子，离子不会发生过渡到I型ELMS已经发现类型III的“”与边缘电流的增加良好相关。当发生大的ELM时，会在电子温度上产生强扰动deltaT（e），并在弹道时标上以nu（burst）160 m s（-1）向内传播。是的。曲率（分别为反磁性）漂移的三分之一（分别为九分之一）。这种传播看起来让人联想到非本地运输实验。大型ELM引起的扰动可以到达ITB。在这种情况下，deltaT（e）在ITB附近增大，然后在内部进一步衰减。这种ELM还会导致ITB处T梯度的瞬时增加，然后在扩散时标内向内移动（chi大约为3 x 10（-2）m（2）s（-1）），同时退化。 [参考：62]

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