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Self-seeding is a promising approach to significantly narrow the SASEbandwidth of XFELs to produce nearly transform-limited pulses. The developmentof such schemes in the soft X-ray wavelength range necessarily involvesgratings as dispersive elements. These introduce, in general, a pulse-fronttilt, which is directly proportional to the angular dispersion. Pulse-fronttilt may easily lead to a seed signal decrease by a factor two or more.Suggestions on how to minimize the pulse-front tilt effect in the self-seedingsetup are given.

Pulse-front tilt caused by the use of a grating monochromator and self-seeding of soft X-ray FELs