As a complex physics system, Tokamak plasma is strongly coupled with external poloidal field. For iron core devices, the transformer magnetization properties play the most important role. Under reasonable magnetizing current filament model, the magnetization curve was drived from external magnetic experimental data detected by flux loops and small pick-up coils. To solve the inverse problem, singular value decomposition (SVD) scheme and iterative procedures were used and proved to be effective. This paves the way for plasma current profile reconstruction, and provides a possible practical solution for in siut transformers' characteristics determination.
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