Self-regulated oscillation of transport and topology of magnetic islands in toroidal plasmas.
Self-regulated oscillation of transport and topology of magnetic islands in toroidal plasmas.
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DOI：
10.1038/srep16165
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发表时间：
2015-11-04
影响因子：
4.6
通讯作者：
Itoh K
中科院分区：
文献类型：
--
作者：
Ida K;Kobayashi T;Evans TE;Inagaki S;Austin ME;Shafer MW;Ohdachi S;Suzuki Y;Itoh SI;Itoh K
运输和磁拓扑结构之间的耦合是一个重要的问题，因为磁岛的结构，嵌入在一个环形平衡场，取决于运输的性质在边缘的岛屿。在DIII-D托卡马克调制的热脉冲传播的测量已经揭示了存在的自我调节振荡的径向能量传输到磁岛，这是在岛的结构和运输附近的q = 2表面的分叉指示。在一个状态中看到大幅度热脉冲，随后在放电中看到小幅度脉冲，导致岛状状态的重复循环。这两种状态被解释为具有高和低热脉冲可达性的磁岛的分叉。本报告描述了托卡马克等离子体中磁岛的输运和拓扑结构之间的耦合动力学中的分叉的发现。
The coupling between the transport and magnetic topology is an important issue because the structure of magnetic islands, embedded in a toroidal equilibrium field, depends on the nature of the transport at the edge of the islands. Measurements of modulated heat pulse propagation in the DIII-D tokamak have revealed the existence of self-regulated oscillations in the radial energy transport into magnetic islands that are indicative of bifurcations in the island structure and transport near the q = 2 surface. Large amplitude heat pulses are seen in one state followed by small amplitude pulses later in the discharge resulting in a repeating cycle of island states. These two states are interpreted as a bifurcation of magnetic island with high and low heat pulse accessibility. This report describes the discovery of a bifurcation in the coupled dynamics between the transport and topology of magnetic islands in tokamak plasmas.