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Figure 4
FERMI FEL-1 setup. A deflecting cavity at the end of the linac, in combination with the beam dump, is used to measure the slice properties of the electron beam (Fig. 5[link]). During FEL operation, the deflection cavity and bending dump are turned off, allowing the beam to enter FEL-1. For the HGHG configuration used for this work, interaction with the laser occurs in the first modulator (Mod1), and bunching is produced in the second dispersive section. Coherent emission is generated at the desired harmonic of the seed laser in the first three undulators of Rad1. The other three undulators are not in resonance.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 32| Part 1| January 2025| Pages 72-81
https://doi.org/10.1107/S1600577524011585
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