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The purified SASE (pSASE) undulator configuration recently proposed at SLACpromises an increase in the output spectral density of XFELs. In this articlewe study a straightforward implementation of this configuration for the softx-ray beamline at the European XFEL. A few undulator cells, resonant at asubharmonic of the FEL radiation, are used in the middle of the exponentialregime to amplify the radiation, while simultaneously reducing the FELbandwidth. Based on start-to-end simulations, we show that with the proposedconfiguration the spectral density in the photon energy range between 1.3 keVand 3 keV can be enhanced of an order of magnitude compared to the baselinemode of operation. This option can be implemented into the tunable-gap SASE3baseline undulator without additional hardware, and it is complementary to theself-seeding option with grating monochromator proposed for the same undulatorline, which can cover the photon energy range between about 0.26 keV and 1 keV.

Purified SASE undulator configuration to enhance the performance of the soft x-ray beamline at the European XFEL