Description:
A new set of baseline parameters of the electron beam and undulator for the European XFEL project has been defined recently. Changes refer to the electron beam emittance, charge, operation at different electron energies, and change of undulator period. According to the present concept, it is planned to vary charge from 20 pC to 1 nC allowing control of the FWHM radiation pulse duration. Operation at different electron energies of 17.5 GeV, 14 GeV, and 10.5 GeV will allow extension of the wavelength range to longer wavelengths. Electron bunches with different charges possess different properties. These features have an impact on photon beam properties which should be taken into account at the design stage optical beamlines and instruments and planning user experiments. In this note we present an overview of the radiation properties generated by SASE FEL radiators driven by electron beam with revised baseline parameters.