FEL2026 - 42nd International Free Electron Laser Conference

Microbunching instability studies and lasing at FERMI with one-and two-stage compression scheme

WEC01

26 Aug 2026, 14:50

25m

Contributed Oral Presentation Session 8: Electron Beam Dynamics Electron Beam Dynamics (Contributed)

Speaker

Giovanni Campri (Elettra-Sincrotrone Trieste S.C.p.A.)

Description

We report on recent experimental sessions at FERMI FEL, characterizing the electron beam longitudinal phase space and the HGHG FEL, in single and double compression scheme. The impact of microbunching instability on the beam dynamics and lasing is recorded, and succesfully compared with predictions from a MBI instability integral model incorporating intrabeam scattering. With the addition of some optics tuning in the FERMI spreader line, such theoretical and experimental advancements have contributed to the emission of fully coherent HGHG harmonic pulses at around 1 nm.

Footnotes

On behalf of the FERMI Team