Observation of an impurity hole in the Large Helical Device
Observation of an impurity hole in the Large Helical Device
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DOI：
10.1088/0029-5515/49/6/062002
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发表时间：
2009-05
期刊：
影响因子：
3.3
通讯作者：
M. Yoshinuma;K. Ida;M. Yokoyama;M. Osakabe;K. Nagaoka;S. Morita;M. Goto;N. Tamura;C. Suzuki-C.
中科院分区：
文献类型：
--
作者：
M. Yoshinuma;K. Ida;M. Yokoyama;M. Osakabe;K. Nagaoka;S. Morita;M. Goto;N. Tamura;C. Suzuki-C.
在大螺旋装置中注入杂质后，观察到碳杂质的极中空轮廓（表示为“杂质空穴”）与离子温度梯度的增加有关。由于离子温度梯度驱动的强烈向外对流，中心碳密度下降到等离子体密度的0.3%，而新古典理论预测了向内对流。输运分析表明，在小半径的一半处，扩散系数为0.4 m2 s - 1，向外对流速度为3 m s - 1。
An extremely hollow profile of carbon impurity (denoted as an ‘impurity hole’) is observed associated with an increase in the ion temperature gradient after an impurity injection in the Large Helical Device. The central carbon density drops to 0.3% of the plasma density due to a strong outward convection driven by the ion temperature gradient, while an inward convection is predicted by neoclassical theory. Transport analysis gives a low diffusion coefficient of 0.4 m2 s−1 and an outward convection velocity of 3 m s−1 at half of the minor radius.