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 and Kong Wei |
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Institution: | 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 of
magnetohydrodynamic (MHD) oscillation on the HT-7 tokamak, and the data
from SX cameras are analysed by using the
Fourier--Bessel harmonic reconstruction method and the singular value
decomposition. The image
reconstruction of SX emissivity is obtained on the assumption of plasma
rigid rotation. One of the important phenomena in the HT-7 discharge is the
transition from the sawtooth oscillations to the MHD oscillations when the
plasma density grows higher. The MHD structure
observed in the SX tomography is featured as follows: the magnetic surface of MHD
structure 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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