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This paper discusses the potential for enhancing the capabilities of theEuropean FEL in the soft X-ray regime. A high longitudinal coherence will bethe key to such performance upgrade. In order to reach this goal we study avery compact soft X-ray self-seeding scheme originally designed at SLAC [1,2].The scheme is based on a grating monochromator, and can be straightforwardlyinstalled in the SASE3 undulator beamline at the European XFEL. For theEuropean XFEL fully-coherent soft X-ray pulses are particularly valuable sincethey naturally support the extraction of more FEL power than at saturation byexploiting tapering in the tunable-gap SASE3 undulator. Tapering consists of astepwise change of the undulator gap from segment to segment. Based onstart-to-end simulations we show that soft X-ray FEL power reaches about 800GW, that is about an order of magnitude higher than the SASE level atsaturation (100 GW). The self-seeding setup studied in this work is extremelycompact (about 5 m long), and cost-effective. This last characteristic mayjustify to consider it as a possible addition to the European XFEL capabilitiesfrom the very beginning of the operation phase.  [1] Y. Feng, J. Hastings, P. Heimann, M. Rowen, J. Krzywinski, and J. Wu,"X-ray Optics for soft X-ray self-seeding the LCLS-II", proceedings of 2010 FELconference, Malmo, Sweden, (2010).  [2] Y. Feng, P. Heimann, J. Wu, J. Krzywinski, M. Rowen, and J. Hastings,"Compact Grating Monochromator Design for LCLS-I Soft X-ray Self-Seeding",https://slacportal.slac.stanford.edu/sites/lcls_public/lcls_ii/Lists/LCLS_II_Calendar/Physics_Meetings.aspx,May 2011 andhttps://sites.google.com/a/lbl.gov/realizing-the-potential-of-seeded-fels-in-the-soft-x-ray-regime-workshop/talks,October 2011

Self-seeding scheme for the soft X-ray line at the European XFEL