Characterization of core microturbulence in L-mode and H-mode regimes on the EAST superconducting tokamak
Characterization of core microturbulence in L-mode and H-mode regimes on the EAST superconducting tokamak
复制标题
EAST 超导托卡马克 L 模式和 H 模式中核心微湍流的表征
DOI：
10.1088/0031-8949/90/2/025603
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发表时间：
2015-02
期刊：
影响因子：
2.9
通讯作者：
G J Wu
中科院分区：
文献类型：
--
作者：
Q Li;X D Zhang;P J Sun;G J Wu
给出了切向CO2激光集体散射系统在EAST托卡马克装置上分别在低(L)和高(H)限制模下提供的核心微湍流(，{k}_(BOT)}{{rho}_{S}}1.5-4.3$)。报道了从L模到H模的岩心微湍流特征的变化：首先，L-H模转变后岩心微湍流的频谱图显示了微湍流在频域中的重新分布；其次，积分谱功率的时间演化表明，H模的岩心微湍流的幅度比L模的大得多；第三，互相关时频谱分析表明L模和H模的岩心微湍流的结构特征有很大的不同。这些结果表明，虽然H模输运势垒的空间范围处于边缘，但从L模到H模，核心微湍流的幅度和结构特征都发生了显著的变化，这可能与等离子体基本参数剖面的变化密切相关。
The core microturbulence (, ${{k} _ {\bot}}{{\rho} _ {s}}\tilde {\} 1.5-4.3$) provided by a tangential CO 2 laser collective scattering system on the EAST tokamak, in low (L) and high (H) confinement mode regimes respectively, are presented. We report the change of core microturbulence characteristics from L-mode to H-mode: firstly, the spectrograms of the core microturbulence show the redistribution of microturbulence in the frequency domain after the L–H transition; secondly, the time evolution of the integrated spectral power displays that the amplitude of the core microturbulence in H-mode is much larger than that in L-mode; thirdly, the cross-correlation time-frequency spectrum analysis indicates that the structural characteristics of the core microturbulence in L-mode and H-mode are very different. These results suggest that both the amplitude and the structural characteristics of the core microturbulence change significantly from L-mode to H-mode, although the spatial extent of the transport barrier in H-mode is at the edge, which could be closely related to the changes of the profiles of basic plasma parameters.
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