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Träfflista för sökning "WFRF:(Cornacchia C.) srt2:(2012)"

Sökning: WFRF:(Cornacchia C.) > (2012)

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1.
  • Allaria, E., et al. (författare)
  • Highly coherent and stable pulses from the FERMI seeded free-electron laser in the extreme ultraviolet
  • 2012
  • Ingår i: Nature Photonics. - 1749-4885. ; 6:10, s. 699-704
  • Tidskriftsartikel (refereegranskat)abstract
    • Free-electron lasers (FELs) are promising devices for generating light with laser-like properties in the extreme ultraviolet and X-ray spectral regions. Recently, FELs based on the self-amplified spontaneous emission (SASE) mechanism have allowed major breakthroughs in diffraction and spectroscopy applications, despite the relatively large shot-to-shot intensity and photon-energy fluctuations and the limited longitudinal coherence inherent in the SASE mechanism. Here, we report results on the initial performance of the FERMI seeded FEL, based on the high-gain harmonic generation configuration, in which an external laser is used to initiate the emission process. Emission from the FERMI FEL-1 source occurs in the form of pulses carrying energy of several tens of microjoules per pulse and tunable throughout the 65 to 20 nm wavelength range, with unprecedented shot-to-shot wavelength stability, low-intensity fluctuations, close to transform-limited bandwidth, transverse and longitudinal coherence and full control of polarization.
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2.
  • Di Mitri, S., et al. (författare)
  • Electron beam optics and trajectory control in the Fermi free electron laser delivery system
  • 2012
  • Ingår i: Physical Review Special Topics. Accelerators and Beams. - 1098-4402. ; 15:1
  • Tidskriftsartikel (refereegranskat)abstract
    • Electron beam optics (particle betatron motion) and trajectory (centroid secular motion) in the FERMI@Elettra free electron laser (FEL) are modeled and experimentally controlled by means of the ELEGANT particle tracking code. This powerful tool, well known to the accelerator community, is here for the first time fully integrated into the Tango-server based high level software of an FEL facility, thus ensuring optimal charge transport efficiency and superposition of the beam Twiss parameters to the design optics. The software environment, the experimental results collected during the commissioning of FERMI@Elettra, and the comparison with the model are described. As a result, a matching of the beam optics to the design values is accomplished and quantified in terms of the betatron mismatch parameter with relative accuracy down to the 10(-3) level. The beam optics control allows accurate energy spread measurements with sub-keV accuracy in dedicated dispersive lines. Trajectory correction and feedback is achieved to a 5 mu m level with the implementation of theoretical response matrices. In place of the empirical ones, they speed up the process of trajectory control when the machine optics is changed, avoid particle losses that may occur during the on-line computation of experimental matrices, and confirm a good agreement of the experimental magnetic lattice with the model.
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