Author: Cinquegrana, P.
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MOP013 The Fermi Seeded FEL Facility: Operational Experience and Future Perspectives 57
  • L. Giannessi, E. Allaria, L. Badano, F. Bencivenga, C. Callegari, F. Capotondi, D. Castronovo, P. Cinquegrana, M. Coreno, R. Cucini, I. Cudin, G. D'Auria, M.B. Danailov, R. De Monte, G. De Ninno, P. Delgiusto, A.A. Demidovich, S. Di Mitri, B. Diviacco, A. Fabris, R. Fabris, W.M. Fawley, M. Ferianis, E. Ferrari, P. Finetti, P. Furlan Radivo, G. Gaio, D. Gauthier, F. Gelmetti, F. Iazzourene, M. Kiskinova, S. Krecic, M. Lonza, N. Mahne, M. Manfredda, C. Masciovecchio, M. Milloch, F. Parmigiani, E. Pedersoli, G. Penco, L. Pivetta, O. Plekan, M. Predonzani, K.C. Prince, E. Principi, L. Raimondi, P. Rebernik Ribič, F. Rossi, E. Roussel, L. Rumiz, C. Scafuri, C. Serpico, P. Sigalotti, M. Svandrlik, C. Svetina, M. Trovò, A. Vascotto, M. Veronese, R. Visintini, D. Zangrando, M. Zangrando
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  FERMI is the seeded FEL user facility in Trieste, Italy, producing photons from the VUV to the soft X-rays with a high degree of coherence and spectral stability. Both FEL lines, FEL-1 and FEL-2, are available for users, down to the shortest wavelength of 4 nm. We report on the completion of the commissioning of the high energy FEL line, FEL-2, on the most recent progress obtained on FEL-1 and on the operational experience for users, in particular those requiring specific FEL configurations, such as two-colour experiments. We will also give a perspective on the improvements and upgrades which have been triggered based on our experience, aiming to maintain as well as to constantly improve the performance of the facility for our user community.  
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Spectro-Temporal Control and Characterization of XUV Pulses from a Seeded Free-Electron Laser  
  • D. Gauthier, E. Allaria, P. Cinquegrana, M.B. Danailov, G. De Ninno, A.A. Demidovich, E. Ferrari, L. Giannessi, G. Penco, P. Rebernik Ribič, P. Sigalotti
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  • G. De Ninno
    University of Nova Gorica, Nova Gorica, Slovenia
  • E. Ferrari
    Università degli Studi di Trieste, Trieste, Italy
  • L. Giannessi
    ENEA C.R. Frascati, Frascati (Roma), Italy
  • B. Mahieu
    LOA, Palaiseau, France
  In ultrafast X-ray science, the knowledge of and the ability to control the spectro-temporal properties of individual X-ray pulses, such as those from free-electron lasers (FELs), constitute a fundamental aspect in the design of new experiments aimed at probing matter with femtosecond temporal resolution. Recent works carried out at the seeded free-electron laser FERMI in Trieste demonstrate that such a device is able to generate light pulses in the XUV spectral region, whose spectro-temporal content can be precisely controlled. These examples rely on the manipulation of the seed laser used as coherent input signal to drive the FEL process. The first experiment demonstrates the phase control of the FEL output pulse through the manipulation of the seed laser frequency chirp. The second is the implementation of a single-shot method for complete pulse characterization. These experiments show not only the first direct evidence of the temporal coherence and the generation of Fourier limited pulses, but they demonstrate the ability to control and shape the spectro-temporal content of the pulses. Consequently, a seeded FEL can be really considered as a laser-like source providing high peak power light pulses. A fine tuning of the light pulses opens the door to new kinds of experiments in the field of coherent nonlinear optics and coherent quantum control.  
slides icon Slides TUB01 [4.430 MB]  
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