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Self-seeding options for the LCLS baseline were recently investigated using ascheme which relies on a single-crystal monochromator in Bragg-transmissiongeometry. The LCLS low-charge (0.02 nC) mode of operation was considered inorder to demonstrate the feasibility of the proposed scheme. The wakefieldeffects from the linac and from the undulator vacuum chamber are much reducedat such low charge, and can be ignored. In this paper we extend our previousinvestigations to the case of the LCLS mode of operation with nominal charge.Based on the LCLS start-to-end simulation for an electron beam charge of 0.25nC, and accounting for the wakefields from the undulator vacuum chamber wedemonstrate that the same simplest self-seeding system (two undulators with asingle-crystal monochromator in between) is appropriate not only for short (fewfemtosecond) bunches, but for longer bunches too.

Self-seeded operation of the LCLS hard X-ray FEL in the long-bunch mode