European XFEL is a multi-beamline x-ray free-electron laser (FEL) user facility driven by a superconducting accelerator with a nominal photon energy range from 250 eV to 25 keV. To extend the photon range towards harder x-rays, an afterburner undulator based on superconducting undulator (SCU) technology is currently being planned. This afterburner undulator would be installed at the end of the already operating SASE2 hard x-ray FEL beamline. The electron bunch is microbunched by the FEL process in the SASE2 undulators and in the SCUs drives emission either at the same wavelength or at a harmonic of the upstream SASE2 undulator. In this contribution we describe numerical simulations of the potential photon output.
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