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Curbis, F.

Paper Title Page
MOAAU03 First Lasing of the Elettra Storage-Ring Free-Electron Laser in Seeded Configuration  
 
  • E. Allaria, M. B. Danailov, B. Diviacco, E. Karantzoulis, L. Romanzin, C. Spezzani, S. Tileva, M. Trovo, G. De Ninno
    ELETTRA, Basovizza, Trieste
  • M. Coreno
    CNR - IMIP, Trieste
  • F. Curbis
    Università degli Studi di Trieste, Trieste
 
  We report the first lasing of the Elettra storage-ring free-electron laser operated in “single-pass” seeded configuration. The external seed was provided by a Ti:Sa laser tuned at 780 and 390 nm, with adjustable repetition rate (10 Hz – 1kHz) and pulse duration (100 fs or 1 ps). We have obtained intense coherent radiation in the spectral range between 130 and 260 nm. Harmonic pulses are characterized by high peak power (orders of magnitudes above spontaneous radiation) and very good stability (fluctuations of few percent). The signal is transform limited. The Elettra optical klystron is made of independent APPLE-type undulators. This allows complete freedom in the choice of light polarization. Presently, all the above features make the Elettra free-electron laser in seeded configuration a unique light source, which is attractive for several user experiments.  
TUCAU03 Seeded Harmonic Generation with the Elettra Storage-Ring Free Electron Laser  
 
  • E. Allaria, M. B. Danailov, G. De Ninno, B. Diviacco, E. Karantzoulis, C. Spezzani, S. Tileva, M. Trovo, F. Curbis
    ELETTRA, Basovizza, Trieste
  • M. Coreno
    CNR - IMIP, Trieste
 
  We have recently demonstrated that the Elettra storage-ring free-electron laser is well suited for producing intense VUV harmonic radiation in seeded "single-pass" configuration. After reviewing the experimental setup, we present here the temporal and spectral characterization of the harmonic pulse with respect to several adjustable parameters, such as the seed power, repetition rate (10 Hz ± 1 kHz) and pulse duration, the seed pulse-electron bunch temporal detuning and the strength of the dispersive section between undulators. Measured peak power in the working wavelength range (i.e., 260-130 nm for the reported experiments) is several orders of magnitude above spontaneous synchrotron radiation. We also show that measurements are in very good agreement with 3D numerical simulations. The obtained results make the Elettra storage-ring free-electron laser in seeded "single-pass" configuration an ideal test facility for next generation linac-based FELs and, at the same time, a ready-to-use light source for user experiments.