Coherent, high repetition rate tender x-ray free-electron laser seeded by an extreme ultra-violet free-electron laser oscillator
V. Petrillo, Michele Opromolla, A. Bacci, F. Broggi, I. Drebot, G. Ghiringhelli, E. Puppin, M. Rossetti Conti, Andrea Rossi, M. Ruijter, S. Samsam, A. Tagliaferri, G. Rossi, L. Serafini
Abstract
Abstract A seeded FEL driven by a linac based on super conducting cavities, generating 10 8 –10 10 coherent photons per shot at 2–5 keV with 0.2–1 MHz of repetition rate, can address the need of a source devoted to fine analysis of matter using the linear spectroscopy technique. The seeding scheme described hereafter is a multi-stage cascade upshifting the radiation frequency by a factor 20–40. The x-ray range can be achieved with a seed constituted by a coherent flash in the extreme ultraviolet range provided by an FEL oscillator operating at 12–14 nm. The whole chain of x-ray generation is described by means of start-to-end three-dimensional simulations.