Status of polarization control experiment at Shanghai deep ultraviolet   free electron laser
  A polarization control experiment by utilizing a pair of crossed undulators has been proposed for the Shanghai deep ultraviolet free electron laser test facility. Numerical simulations indicate that, with the electromagnetic phase-shifter located between the two crossed planar undulators, fully coherent radiation with 100 nJ order pulse energy, 5 picoseconds pulse length and circular polarization degree above 90% could be generated. The physical design study and the preparation status of the experiment are presented in the paper. 
Haixiao Deng, Tong Zhang, Lie Feng, Bo Liu, Jianhui Chen, Zhimin Dai,   Yong Fan, Chao Feng, Yongzhou He, Taihe Lan, Lin Son...
physics.acc-ph physics.optics