Experimental observation of (intermediate, high)-k micro-turbulence in different type H mode plasmas in EAST
Experimental observation of (intermediate, high)-k micro-turbulence in different type H mode plasmas in EAST
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DOI：
10.1063/1.5029516
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发表时间：
2018-08
影响因子：
2.2
通讯作者：
G. Wu;Y. Li;P. Sun;P. Li;J. Bi;S. X. Wang;H. Liu;X. Zhang;L. Hu
中科院分区：
文献类型：
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作者：
G. Wu;Y. Li;P. Sun;P. Li;J. Bi;S. X. Wang;H. Liu;X. Zhang;L. Hu
利用EAST极向CO2激光集体散射系统同时测量了梯度区等离子体中k1 = 12 cm −1（中k）和k2 = 22 cm−1（高k）的微湍流（k <$ρs <$1 -4）。它们的行为进行了详细研究，在ELM自由/III型ELMy和增强Da（EDA）H模式等离子体放电。与前一个L模阶段相比，在无ELM或III型ELMy H模阶段，低k（k1）微湍流的平均频率明显增加，而高k（k2）微湍流的平均频率降低，而k1和k2微湍流的频率积分谱功率（Stot）几乎相同。另一方面，在EDA H模式阶段，Stot和k1/k2微湍流的平均频率都显示出持续的增加。这些结果表明，（中，高）-k微湍流对不同类型的H模式的响应是不同的。进一步对k1和k2微湍流之间的互相关分析表明，它们在H模相位时的互相关值比先前的L模相位时的互相关值稍低。还可以发现，互相关值在无ELM和随后的III型ELMy阶段期间逐渐减小，并且在EDA H模式阶段中几乎为零。利用EAST极向CO2激光集体散射系统同时测量了梯度区等离子体中k1 = 12 cm−1（中k）和k2 = 22 cm−1（高k）的微湍流（k <$ρs <$1 -4）。它们的行为进行了详细研究，在ELM自由/III型ELMy和增强Da（EDA）H模式等离子体放电。与前一个L模阶段相比，在无ELM或III型ELMy H模阶段，低k（k1）微湍流的平均频率明显增加，而高k（k2）微湍流的平均频率降低，而k1和k2微湍流的频率积分谱功率（Stot）几乎相同。另一方面，在EDA H模式阶段，Stot和k1/k2微湍流的平均频率都显示出持续的增加。这些结果表明，（中，高）-k微湍流对不同类型的H m的响应。
Both k1 = 12 cm−1 (intermediate-k) and k2 = 22 cm−1 (high-k) micro-turbulence (k⊥ρs ∼ 1–4) in gradient region plasmas were measured simultaneously by the EAST poloidal CO2 laser collective scattering system. Their behaviors have been studied in detail in both ELM-free/type III ELMy and enhanced Da (EDA) H mode plasma discharges. Compared with that in the previous L mode phase, it can be seen obviously that the mean frequency of lower-k (k1) micro-turbulence increases and that of higher-k (k2) decreases during the ELM-free or type III ELMy H mode phase, while frequency-integrated spectral power (Stot) of both k1 and k2 micro-turbulence seems almost the same. On the other hand, both Stot and mean frequency of k1/k2 micro-turbulence show continuous increase during the EDA H mode phase. These results imply that the response of (intermediate, high)-k micro-turbulence on different type H mode is different. Further cross-correlation analysis between k1 and k2 micro-turbulence shows that their cross-correlation value is a little lower in H mode phase than the previous L mode phase. It can also be found that the cross-correlation value decreases gradually during the ELM-free and subsequent type-III ELMy phases, and it is almost zero in the EDA H mode phase. These new results could shed some light on the comprehensive understanding of mechanisms under H mode physics.Both k1 = 12 cm−1 (intermediate-k) and k2 = 22 cm−1 (high-k) micro-turbulence (k⊥ρs ∼ 1–4) in gradient region plasmas were measured simultaneously by the EAST poloidal CO2 laser collective scattering system. Their behaviors have been studied in detail in both ELM-free/type III ELMy and enhanced Da (EDA) H mode plasma discharges. Compared with that in the previous L mode phase, it can be seen obviously that the mean frequency of lower-k (k1) micro-turbulence increases and that of higher-k (k2) decreases during the ELM-free or type III ELMy H mode phase, while frequency-integrated spectral power (Stot) of both k1 and k2 micro-turbulence seems almost the same. On the other hand, both Stot and mean frequency of k1/k2 micro-turbulence show continuous increase during the EDA H mode phase. These results imply that the response of (intermediate, high)-k micro-turbulence on different type H m...