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The magnetic gap of the baseline XFEL undulators can be varied mechanicallyfor wavelength tuning. In particular, the wavelength range 0.1 nm - 0.4 nm canbe covered by operating the European XFEL with the SASE2 undulator. The lengthof the SASE2 undulator (256.2 m) is sufficient to independently generate threepulses of different radiation wavelengths at saturation. Normally, if a SASEFEL operates in saturation, the quality of the electron beam is too bad forgeneration of SASE radiation in the subsequent part of undulator which isresonant at a few times longer wavelength. The new method of SASEundulator-switching based on the rapid switching of the FEL amplificationprocess proposed in this paper is an attempt to get around this obstacle. Usingmechanical SASE shutters installed within short magnetic chicanes in thebaseline undulator, it is possible to rapidly switch the FEL photon beam fromone wavelength to another, providing simultaneous multi-color capability.Combining this method with a photon-beam distribution system can provide anefficient way to generate a multi-user facility.

Control of the amplification process in baseline XFEL undulator with mechanical SASE switchers