Magnetohydrodynamic Stability of Improved Confinement Plasmas in JT-60U
Magnetohydrodynamic Stability of Improved Confinement Plasmas in JT-60U
复制标题
JT-60U 中改进约束等离子体的磁流体动力学稳定性
DOI：
10.13182/fst02-a229
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发表时间：
2002
影响因子：
0.9
通讯作者：
T. Tuda
中科院分区：
文献类型：
--
作者：
S. Takeji;A. Isayama;T. Ozeki;Shinji Tokuda;Y. Ishii;T. Oikawa;S. Ishida;Y. Kamada;Y. Neyatani;R. Yoshino;T. Takizuka;N. Hayashi;T. Fujita;G. Kurita;T. Matsumoto;T. Tuda
总结了在磁流体动力学 (MHD) 稳定性理解方面取得的进展，包括改进约束的 JT-60U 托卡马克放电，例如（热离子）H 模式、高 βp 模式、高 βp H 模式和反向剪切放电。由于局部大的压力梯度和相关的自举电流，传输障碍对于改善限制至关重要，在局部和全局 MHD 稳定性中发挥着关键作用。这些放电的破坏性 β 极限与具有低环形模数 n 的理论理想扭结气球稳定性极限一致。通过利用高等离子体内电感、等离子体成形和壁稳定来拓宽压力分布，可改善可实现的 β 极限。仔细分析了分别与边缘和内部传输势垒相关的边缘局部模式（ELM）和势垒局部模式（BLM）。 n ≤ 3 的电阻交换模式在具有内部传输势垒的反向剪切放电中在负剪切区域中被激发，并通过与正剪切区域中的撕裂模式的非线性耦合偶尔导致严重塌陷。研究了归因于新古典撕裂模式的低 m/n（m：极向模数）撕裂模式的 MHD 特性。使用基本的 O 模式电子回旋波注入演示了撕裂模式的稳定性和锯齿活动的控制。识别与电流驱动和压力驱动的低n外部扭结模式相关的电阻壁模式。
Progress in the understanding of magnetohydrodynamic (MHD) stability is summarized on JT-60U tokamak discharges with improved confinement such as the (hot-ion) H-mode, high-βp mode, high-βp H-mode, and reversed shear discharges. Transport barriers, which are essential for the improved confinement, play key roles in the local and global MHD stability owing to the local large pressure gradient and the related bootstrap current. Disruptive β limits of these discharges are consistent with theoretical ideal kink-ballooning stability limits with low toroidal mode numbers n. Achievable β limit is improved by broadening of the pressure profile with high plasma internal inductance, plasma shaping, and wall stabilization. Edge localized modes (ELMs) and barrier localized modes (BLMs), which are associated with edge and internal transport barriers, respectively, are analyzed carefully. Resistive interchange modes with n ≤ 3 are excited in the negative shear region in reversed shear discharges with the internal transport barrier and lead to major collapse occasionally through nonlinear coupling with a tearing mode in the positive shear region. MHD characteristics of low m/n (m: poloidal mode number) tearing modes, which are attributed to the neoclassical tearing mode, are investigated. Stabilization of tearing modes and control of sawtooth activity are demonstrated using the fundamental O-mode electron cyclotron wave injection. Resistive wall modes associated with current-driven and pressure-driven low n external kink modes are identified.
影响因子：
8.6
作者：
Ishida, S;Fujita, T;Yoshino, R
通讯作者：
Yoshino, R
影响因子：
2.2
作者：
Sauter, O;LaHaye, RJ;Yoshino, R
通讯作者：
Yoshino, R