Solitary perturbations in the steep boundary of magnetized toroidal plasma.
Solitary perturbations in the steep boundary of magnetized toroidal plasma.
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DOI：
10.1038/srep45075
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发表时间：
2017-03-24
影响因子：
4.6
通讯作者：
Park YS
中科院分区：
文献类型：
--
作者：
Lee JE;Yun GS;Lee W;Kim MH;Choi M;Lee J;Kim M;Park HK;Bak JG;Ko WH;Park YS
在KSTAR托卡马克装置中，在磁化环形等离子体的高压梯度边界区（称为基座）部分坍缩前~100 μs内，观测到了极向和径向的孤立子扰动（SPs）。SP的发展与一个低的环形模式数（通常为1）的基座根深蒂固的准稳定的边缘本地化模式（QSM），通常出现在崩溃期间。与QSM相比，SP具有较小的模式间距和不同的（通常相反的）旋转速度。类似的孤立扰动也经常观察到完全基座崩溃的发病前，这表明SP代和基座崩溃之间的强连接。
Solitary perturbations (SPs) localized both poloidally and radially are detected within ~100 μs before the partial collapse of the high pressure gradient boundary region (called pedestal) of magnetized toroidal plasma in the KSTAR tokamak device. The SP develops with a low toroidal mode number (typically unity) in the pedestal ingrained with quasi-stable edge-localized mode (QSM) which commonly appears during the inter-collapse period. The SPs have smaller mode pitch and different (often opposite) rotation velocity compared to the QSMs. Similar solitary perturbations are also frequently observed before the onset of complete pedestal collapse, suggesting a strong connection between the SP generation and the pedestal collapse.