Ergodic edge region of large helical device
Ergodic edge region of large helical device
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大型螺旋装置的遍历边缘区域
DOI：
10.1016/s0022-3115(02)01467-8
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发表时间：
2003
影响因子：
3.1
通讯作者：
K. Matsuoka
中科院分区：
文献类型：
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作者：
T. Morisaki;K. Narihara;S. Masuzaki;S. Morita;M. Goto;A. Komori;N. Ohyabu;O. Motojima;K. Matsuoka
使用柯尔莫哥洛夫长度作为度量，定量估计了大型螺旋装置中各种真空磁配置的遍历性。研究发现，边缘电子温度分布在最后闭合通量表面（LCFS）外几厘米处遍历性开始增加的位置处改变其梯度。在剖面中，在 LCFS 处没有看到等离子体参数的显着变化，这表明在 LCFS 外部存在一个区域，该区域的限制性能相对与封闭区域中的一样好。还使用简单的能量平衡方程估算了径向电子热导率，并证实热导率受遍历性的强烈影响。利用遍历性和电子热导率之间的关系，提出了基于实验的 LCFS 的新实用定义。
Ergodicity in various vacuum magnetic configurations in large helical device was quantitatively estimated, using the Kolmogorov length as a measure. It is found that the edge electron temperature profile changes its gradient at the position where the ergodicity begins to increase several cm outside the last closed flux surface (LCFS). In the profiles no distinguished change of plasma parameters was seen at the LCFS, which suggests the existence of a region just outside the LCFS where the confinement performance is relatively as good as that in the closed region. The radial electron heat conductivity was also estimated using a simple energy balance equation and it was confirmed that the conductivity is strongly affected by the ergodicity. Using the relationship between ergodicity and electron heat conductivity, a new practical definition of the LCFS based on the experiments is proposed.
S. Sudo、Y. Nagayama、M. Emoto、M. Goto、Y. Hamada、K. Ida、T. Ido、H. Iguchi、S. Inagaki、M. Isobe、K. Kawahata、K. KMopenkov、S.
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