Reconstruction of experimental axisymmetric equilibria is an important part of toka-mak data analysis.Fourier expansion is applied to reconstruct the vessel current distribution inEFIT code.Benchmarking and testing calculations are performed to evaluate and validate thisalgorithm.Two cases for circular and non-circular plasma discharges are presented.Fourier ex-pansion used to fit the eddy current is a robust method and the real time EFIT can be introducedto the plasma control system in the coming campaign.
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