High-confinement-mode edge stability of Alcator C-mod plasmas
High-confinement-mode edge stability of Alcator C-mod plasmas
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DOI：
10.1063/1.1561618
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发表时间：
2003-04
影响因子：
2.2
通讯作者：
D. Mossessian;P. Snyder;A. Hubbard;J. Hughes;M. Greenwald;B. LaBombard;J. Snipes;S. Wolfe;H. Wilson
中科院分区：
文献类型：
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作者：
D. Mossessian;P. Snyder;A. Hubbard;J. Hughes;M. Greenwald;B. LaBombard;J. Snipes;S. Wolfe;H. Wilson
对于稳态高限制模式（H 模式）操作，需要松弛机制来限制边缘梯度和杂质含量的积累。 Alcator C-Mod [Hutchinson 等人，Phys。 Plasmas 1, 1511 (1994)]看到了两种这样的机制——EDA（增强型 D-alpha H 模式）和草地 ELM（边缘局部模式），但没有大型 I 型 ELM。在 EDA 中，边缘弛豫由边缘局域准相干 (QC) 电磁模式提供，该电磁模式存在于中等基座温度 T 3.5 下，并且不限制边缘压力梯度的形成。该模式操作空间的 q 边界取决于等离子体形状，q95 极限随着等离子体三角形度的增加而向下移动。在高边缘压力梯度和温度下，模式被宽带波动 (f<50 kHz) 取代，并且观察到小的不规则 ELM。理想的 MHD（磁流体动力学）稳定性分析，包括压力和电流驱动边缘模式...
For steady state high-confinement-mode (H-mode) operation, a relaxation mechanism is required to limit build-up of the edge gradient and impurity content. Alcator C-Mod [Hutchinson et al., Phys. Plasmas 1, 1511 (1994)] sees two such mechanisms—EDA (enhanced D-alpha H mode) and grassy ELMs (edge localized modes), but not large type I ELMs. In EDA the edge relaxation is provided by an edge localized quasicoherent (QC) electromagnetic mode that exists at moderate pedestal temperature T 3.5, and does not limit the buildup of the edge pressure gradient. The q boundary of the operational space of the mode depends on plasma shape, with the q95 limit moving down with increasing plasma triangularity. At high edge pressure gradients and temperatures the mode is replaced by broadband fluctuations ( f<50 kHz) and small irregular ELMs are observed. Ideal MHD (magnetohydrodynamic) stability analysis that includes both pressure and current driven edge modes...