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As one of the next generation FEL technologies, staggered array undulator (SAU) made by high Tc superconductor (HTSC) is developed to achieve small size and high intensity magenetic field undulator. In use of supercondutor magnet, it is very difficult to adjust the magnet array of the undulator after magnetization since the entire of the undulator is install inside a cryostat, therefore appropreate magnet alignment has to be determined before the magnetization. This paper present a development of a numerical simulation code of the SAU magnetization process to assist the design of optimal alignment of the SAU magnets. Keywords— Fee Electron Laser (FEL), High Tc Superconductor (HTSC), Current Vector Pontential Method (T-method), Critical Current Model, Finite Difference Method (FDM)

Design of HTSC Undulator Magnet Array Based on Simulation of Magnetization Process