• Y. Li, W. Decking, B. Faatz, J. Pflüger
  DESY, Hamburg

At the European XFEL circular polarized radiation in the wavelength range 0.4-1.6 nm is highly desired. An economically and technically convenient method is to utilize a long planar undulator to pre-bunch electron beam first and then pass it through a shorter and specially designed undulator to generate arbitrary polarized radiation. Between these two parts, the electrons and the radiation from the long undulator must be spatially separated by a bend. In this paper, a solution for an isochronous bend is presented considering nonlinear aberrations, which preserves theμbunching even for the 0.4 nm case.