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X-ray Free Electron Lasers combine high pulse power, short pulse length, narrow bandwidth and a high degree of transverse coherence. Any increase in the photon pulse power, while shortening the pulse length, will further push the frontier on several key XFEL applications including single molecule imaging and novel nonlinear X-ray methods. This work shows experimental results at the Linac Coherent Light Source raising its maximum power to more than 300% of the current limit, while reducing the photon pulse length to 10 fs. This was achieved by minimizing residual transverse-longitudinal centroid beam offsets (beam yaw) and dispersion when operating over 6 kA peak current with a longitudinally shaped beam. Even shorter pulses of 3 fs were achieved by combination of this high current mode with an emittance spoiling foil.

Generation of High Power, High Intensity, Ultra Short X-Ray FEL Pulses