The results of three-dimensional (3-D) magnetic field analysis of a variably polarizing undulator for the Super-SOR project are presented. In this analysis, the 3-D magnetic fields due to the magnet arrays of the undulator were calculated for three polarization modes and magnetic field errors due to iron beams supporting the magnet arrays were also estimated for the three modes. Furthermore effects of eddy currents of the undulator vacuum chamber were studied for 1Hz switching of left-and right-handed circular polarization states that is achieved by mechanical driving of the magnet arrays.
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