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An important goal for any advanced X-ray FEL is an option for providingFourier-limited X-ray pulses. In this way, no monochromator is needed in theexperimental hall. Self-seeding is a promising approach to significantly narrowthe SASE bandwidth to produce nearly transform-limited pulses. These areimportant for many experiments including 3D diffraction imaging. We discuss theimplementation of a single-crystal self-seeding scheme in the hard X-ray linesof the European XFEL. For this facility, transform-limited pulses areparticularly valuable since they naturally support the extraction of more FELpower than at saturation by exploiting tapering in the tunable-gap baselineundulators. Tapering consists of a stepwise change of the undulator gap fromsegment to segment. Based on start-to-end simulations dealing with theup-to-date parameters of the European XFEL, we show that the FEL power reachesabout 400 GW, or one order of magnitude higher power than the SASE saturationlevel (20 GW). This analysis indicates that our self-seeding scheme is notsignificantly affected by non-ideal electron phase-space distribution, andyields about the same performance as in the case for an electron beam withideal parameters. The self-seeding scheme with a single crystal monochromatoris extremely compact (about 5 m long), and cost estimations are low enough toconsider adding it to the European XFEL capabilities from the very beginning ofthe operation phase.

Production of transform-limited X-ray pulses through self-seeding at the European X-ray FEL