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arXiv 1705.09487physics.plasm-ph
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大尺度磁岛与小尺度turbulence的多尺度相互作用

Multiscale interaction between a large scale magnetic island and small scale turbulence

M. J. Choi, J. Kim, J. -M. Kwon, H. K. Park, Y. In, W. Lee, K. D. Lee, G. S. Yun, J. Lee, M. Kim, W. -H. Ko, J. H. Lee, Y. S. Park, Y. -S. Na, N. C. Luhmann, B. H. Park

摘要:

磁岛和湍流之间的多尺度相互作用已被证明通过同时二维测量的湍流和温度和流量剖面。磁岛和湍流通过电子温度($T_e$)梯度、$T_e$湍流和极向流之间的耦合相互作用。被磁岛改变的$T_e$梯度在磁岛外部达到峰值,在磁岛内部变平。$T_e$湍流可出现在$T_e$梯度增大的区域。$T_e$梯度和极向流剪切的联合作用决定了$T_e$湍流的二维分布。当反向极向流形成时,它可以保持最陡的$T_e$梯度,磁岛更像是电子热输运势垒。有趣的是,当$T_e$梯度、$T_e$湍流和流动剪切增加到超过临界水平时,磁岛变成快速电子热传输通道,这直接导致微小的破坏。

英文摘要:

Multiscale interaction between the magnetic island and turbulence has been demonstrated through simultaneous two-dimensional measurements of turbulence and temperature and flow profiles. The magnetic island and turbulence mutually interact via the coupling between the electron temperature ($T_e$) gradient, the $T_e$ turbulence, and the poloidal flow. The $T_e$ gradient altered by the magnetic island is peaked outside and flattened inside the island. The $T_e$ turbulence can appear in the increased $T_e$ gradient regions. The combined effects of the $T_e$ gradient and the the poloidal flow shear determine two-dimensional distribution of the $T_e$ turbulence. When the reversed poloidal flow forms, it can maintain the steepest $T_e$ gradient and the magnetic island acts more like a electron heat transport barrier. Interestingly, when the $T_e$ gradient, the $T_e$ turbulence, and the flow shear increase beyond critical levels, the magnetic island turns into a fast electron heat transport channel, which directly leads to the minor disruption.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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