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Noise suppression for MHD characterization with electron cyclotron emission imaging 1D technique
Plasma Physics and Controlled Fusion ( IF 2.2 ) Pub Date : 2021-03-19 , DOI: 10.1088/1361-6587/abe9f2
G Yu 1 , G J Kramer 2 , Y Zhu 1 , X Li 3 , Y Wang 1 , A Diallo 2 , Y Ren 2 , J H Yu 1 , Y Chen 1 , X Liu 1 , J Cao 1 , B Zhao 4 , M Austin 4 , N C Luhmann Jr 1
Affiliation  

Significant noise suppression for magnetohydrodynamics (MHD) mode characterization in the spatial and spectral domain is achieved by processing two-dimensional (2D) electron cyclotron emission imaging (ECEI) data with a one-dimensional (1D) ECEI technique using a short time window ($1\;{\text{ms}}$). The technique is applied to detect toroidal Alfven eigenmodes (TAEs) in the temporal spectrum and fit their radial envelope using the data from the DIII-D tokamak W-band 2D ECEI system. Using the data length (time window) of only 1 ${\text{ms}}$, the 1D ECEI can clearly detect the TAEs (∼100 ${\text{kHz}}$) on the spectrum, while similar spectrum quality requires ∼10 ${\text{ms}}$ data length with the cross power spectrum between two midplane ECEI channels. The 1D ECEI technique also effectively avoids biased fitting when resolving the fine structure of the TAE’s radial envelope. The radially spatial resolution of 1D ECEI is constrained by the finite ECE radiation volume of the ECEI receiver. With forward radiation modeling, we find the DIII-D ECEI system can sensitively measure the even parity MHD activities, for which the mode width is >15 mm, and tearing modes (odd parity MHD activities), for which the island full width is >30 mm.



中文翻译:

使用电子回旋发射成像一维技术进行 MHD 表征的噪声抑制

通过使用短时间窗口的一维 (1D) ECEI 技术处理二维 (2D) 电子回旋发射成像 (ECEI) 数据,在空间和谱域中对磁流体动力学 (MHD) 模式表征进行了显着的噪声抑制。$1\;{\text{ms}}$)。该技术用于检测时间谱中的环形阿尔芬本征模 (TAE),并使用来自 DIII-D 托卡马克 W 波段 2D ECEI 系统的数据拟合其径向包络。使用仅 1 的数据长度(时间窗口)${\text{ms}}$,一维 ECEI 可以清楚地检测${\text{kHz}}$光谱上的TAE(~100 ),而类似的光谱质量需要~10${\text{ms}}$数据长度与两个中板 ECEI 通道之间的交叉功率谱。在解析 TAE 径向包络的精细结构时,1D ECEI 技术还有效地避免了偏差拟合。一维 ECEI 的径向空间分辨率受 ECEI 接收器有限 ECE 辐射体积的限制。通过前向辐射建模,我们发现 DIII-D ECEI 系统可以灵敏地测量模宽 >15 mm 的偶奇偶 MHD 活动和岛全宽 > 的撕裂模式(奇偶奇偶 MHD 活动) 30 毫米。

更新日期:2021-03-19
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