Pohang University of Science and Technology, Pohang 790-784, Korea.
National Fusion Research Institute, Daejeon 34133, Korea.
Sci Rep. 2017 Mar 24;7:45075. doi: 10.1038/srep45075.
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.
在 KSTAR 托卡马克装置中，磁化环形等离子体的高压梯度边界区域（称为“台基”）局部崩溃之前约 100μs 内，检测到沿极向和径向局域的单个扰动（SPs）。SP 沿台基内的准稳定边缘局域模（QSM）以低环向模式数（通常为 1）发展，QSM 通常出现在崩溃之间的时期。与 QSM 相比，SPs 的模间距更小，旋转速度也不同（通常相反）。在完全台基崩溃开始之前，也经常观察到类似的单个扰动，这表明 SP 的产生与台基崩溃之间存在很强的联系。
