Tomographic analysis of the central magnetohydrodynamic oscillations on the HT-7 tokamak |
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| Authors: | Ma Tian-Peng Ruan Huai-Lin Hu Li-Qun Wan Bao-Nian Gao Xiang Zhen Xiang-Jun Zhou Li-Wu Sun You-Wen Gao Wei Chen Zhong-Yong Lin Shi-Yao Kong Wei |
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| Affiliation: | Institute of Plasma Physics, Chinese Academy of Science, Hefei 230031, China; Institute of Electronic Engineering, Hefei 230037, China |
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| Abstract: | ![]()
Multi-channel soft x-ray (SX) detectors are applied to generate images ofmagnetohydrodynamic (MHD) oscillation on the HT-7 tokamak, and the datafrom SX cameras are analysed by using theFourier--Bessel harmonic reconstruction method and the singular valuedecomposition. The imagereconstruction of SX emissivity is obtained on the assumption of plasmarigid rotation. One of the important phenomena in the HT-7 discharge is thetransition from the sawtooth oscillations to the MHD oscillations when theplasma density grows higher. The MHD structureobserved in the SX tomography is featured as follows: the magnetic surface of MHDstructure is made up of the crescent-shaped ``hot core' and the circular``cold bubble'. The structure of the magnetic surface is relatively stable.It rotates in the direction of the electron diamagnetic drift at a frequency being the oscillation frequency of the MHD oscillations. |
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| Keywords: | soft x-ray tomography magnetohydrodynamic oscillation singular value decomposition |
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