Author: Allaria, E.
Paper Title Page
TUPP31
 Micro-Bunching Measurements at FERMI  
 
  • M. Veronese, E. Allaria, S. Di Mitri, M. Ferianis, L. Giannessi, G. Penco, P. Rebernik Ribič, S. Spampinati, C. Spezzani, M. Trovò
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  • E. Ferrari
    PSI, Villigen PSI, Switzerland
  • G. Perosa
    Università degli Studi di Trieste, Trieste, Italy
  • P. Rebernik Ribič
    University of Nova Gorica, Nova Gorica, Slovenia
  • E. Roussel
    PhLAM/CERLA, Villeneuve d’Ascq, France
  
  The origin and evolution of micro-bunching (u-B) in a LINAC is very important for Free Electron laser (FEL), a key knowledge to full control and highest quality of the FEL radiation. The experimental u-B characterization is not simple, due to the measurement complexity, considering the u-B extended spectral range and its interplay with other machine effects. At FERMI, we have measured u-B signatures using different techniques, including intensity characterization of Coherent OTR(visible range) and the FFT based modulation analysis performed on the spectrometer images. The latter available both at the first bunch compressor and at the diagnostics beam dump. The beating of two laser pulses at laser heater has been used to induce narrow-band micro-bunching modulations, used as a known probe, to study the FEL / u-B instability spectra. As spectral measurement technique, the distribution of Coherent-TR in the IR region, using BP filters and PbSe detectors, has been implemented. More recently, a new IR spectrometer based on a CaF2 prism and a scanning technique has been developed and installed. Here we present techniques and the experimental results obtained and future perspectives.  
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