This paper presents a simulation of magnetization process of a high-Tc superconductor (HTS), which is used for undulator magnets of X-ray Fee Electron Laser. The numerical analysis is carried out by a current vector potential method (T-method). In particular, it is discussed to use a power law macro-model for behavior of shielding current in the HTS. It is shown that the power low macro-model provides us better agreement with measurements for the final stage magnetic field distribution compared with conventional simulations based on a critical current macro-model.
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