The soft X-ray imaging system on HT-7 is introduced. Fourier-Bessel expansionmethod is used to reconstruct the soft X-ray emission distribution. Simulation results show thatthe inversion accuracy is associated with the angular expansion limit and the hot core displacement.In addition, tomographic results of sawtooth oscillations in a typical low hybrid current drive(LHCD) plasma are presented. It is shown that the reconstructions are reliable to analyze theperturbative mode and the evolution.
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