Two-bunch operation with ns temporal separation at the FERMI FEL facility

Giuseppe Penco, Enrico Allaria, Silvano Bassanese, Paolo Cinquegrana, Stefano Cleva, Miltcho B Danailov, Alexander Demidovich, Mario Ferianis, Giulio Gaio, Luca Giannessi, Claudio Masciovecchio, Mauro Predonzani, Fabio Rossi, Eleonore Roussel, Simone Spampinati, Mauro Trovò

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4 Citations (Scopus)


In the last decade, a continuous effort has been dedicated to extending the capabilities of existing free-electron lasers (FELs) operating in the x-ray and vacuum ultraviolet regimes. In this framework, the generation of two-color (or multi-color) temporally separated FEL pulses, has paved the way to new x-ray pump and probe experiments and several two-color two-pulse schemes have been implemented at the main facilities, but with a generally limited time-separation between the pulses, from 0 to few hundreds of fs. This limitation may be overcome by generating light with two independent electron bunches, temporally separated by integral multiples of the radio-frequency period. This solution was investigated at FERMI, measurements and characterization of this two-bunch mode of operation are presented, including trajectory control, impact of longitudinal and transverse wakefields, manipulation of the longitudinal phase space and finally a demonstration of suitability of the scheme to provide extreme ultraviolet light by using both bunches.
Original languageEnglish
Article number053047
Pages (from-to)-
JournalNew Journal of Physics
Issue number5
Publication statusPublished - 1 May 2018
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Penco, G., Allaria, E., Bassanese, S., Cinquegrana, P., Cleva, S., Danailov, M. B., Demidovich, A., Ferianis, M., Gaio, G., Giannessi, L., Masciovecchio, C., Predonzani, M., Rossi, F., Roussel, E., Spampinati, S., & Trovò, M. (2018). Two-bunch operation with ns temporal separation at the FERMI FEL facility. New Journal of Physics, 20(5), -. [053047].