The presented set of parameters for SASE X-FEL beamlines are based on configurations as given in the DESY-TESLA conceptional design report. The present range of photon wavelengths is delivered by several undulator designs and two electron energy ranges from 1-25GeV and 20-30GeV. A wavelength of 1A (12.39keV) is the design goal for TESLA X- FEL undulator beamlines. The possibility to extend the wavelength range to a shorter wavelength of 0.86A (14.4keV), essential for the Mossbauer community, seems feasible. Possible setups of optical elements in typical photon beampaths are shown. Properties and necessary enhancements of these elements and of calculations are discussed.
"Photon beamlines at TESLA X-FEL undulators", Proc. SPIE 4143, X-Ray FEL Optics and Instrumentation, (25 January 2001); doi: 10.1117/12.413687; https://doi.org/10.1117/12.413687