Abstract
A design concept for a soft X-ray monochromator that can preserve the length of a FEL pulse at the femtosecond level is presented. The design is based around a plane diffraction grating in a classical mount operating in collimated light. Designing the beamline requires a thorough knowledge of the source behaviour, which is achieved by wavefront propagation of the simulations of the FEL output. The effect on the spectral filtering on the pulse profile has been explored and is found to improve the contrast ratio without significantly reducing the peak power.
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