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Tomography based on poloidal harmonic expansion is modified to be applied to an elliptical source in order to investigate the internal mode structures due to tearing modes in the ℓ = 2 stellarator configuration. This method was applied to the soft X-ray signals of the JIPP T-II stellarator and the image of the m = 2 magnetic island of the plasma was obtained.
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Tsuji et al. (1982) studied this question.
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