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A polarization control experiment by utilizing a pair of crossed undulatorshas been proposed for the Shanghai deep ultraviolet free electron laser testfacility. Numerical simulations indicate that, with the electromagneticphase-shifter located between the two crossed planar undulators, fully coherentradiation with 100 nJ order pulse energy, 5 picoseconds pulse length andcircular polarization degree above 90% could be generated. The physical designstudy and the preparation status of the experiment are presented in the paper.

Status of polarization control experiment at Shanghai deep ultraviolet free electron laser