Photon sources and instrumentation Figure 1. (a) Extended performance for the upgraded FEL-1 in EEHG (red) compared to standard performance (black) and the best achieved ones (blue) over the past 12 years with the original FEL. Typical FEL trend for pulse energy (b) and spectra (c) with the upgraded EEHG setup at 14 nm. d) single shot image of the FEL spectrum at 8.5 nm obtained with the EEHG setup. C. Masciovecchio1 and L. Giannessi1 on behalf of the FERMI team 1 Elettra - Sincrotrone Trieste S.C.p.A., Trieste, Italy e-mail: claudio.masciovecchio@elettra.eu; luca.giannessi@elettra.eu Elettra Highlights 2024–2025 155
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