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Output characteristics of the European XFEL have been previously studiedassuming an operation point at 5 kA peak current. In this paper we explore thepossibility to go well beyond such nominal peak current level. In order toillustrate the potential of the European XFEL accelerator complex we consider abunch with 0.25 nC charge, compressed up to a peak current of 45 kA. Anadvantage of operating at such high peak current is the increase of the x-rayoutput peak power without any modification to the baseline design. Based onstart-to-end simulations, we demonstrate that such high peak current, combinedwith undulator tapering, allows one to achieve up to a 100-fold increase in apeak power in the conventional SASE regime, compared to the nominal mode ofoperation. In particular, we find that 10 TW-power level, femtosecond x-raypulses can be generated in the photon energy range between 3 keV and 5 keV,which is optimal for single biomolecule imaging. Our simulations are based onthe exploitation of all the 21 cells foreseen for the SASE3 undulator beamline,and indicate that one can achieve diffraction to the desired resolution with 15mJ (corresponding to about 3e13 photons) in pulses of about 3 fs, in the caseof a 100 nm focus at the photon energy of 3.5 keV.

Proposal to generate 10 TW level femtosecond x-ray pulses from a baseline undulator in conventional SASE regime at the European XFEL