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Huening, M.

Paper Title Page
THPP035 Observation of Femtosecond Bunch Length Using a Transverse Deflecting Structure 538
 
  • M. Huening, A. Bolzmann, H. Schlarb
    DESY, Hamburg
  • J.C. Frisch, D.J. McCormick, M.C. Ross, T.J. Smith
    SLAC, Menlo Park, California
  • J. Rossbach
    Uni HH, Hamburg
  
 

The design of the VUV-FEL at DESY demands bunch lengths in the order of 50 fs and below.For the diagnostic of such very short bunches a transverse deflecting RF structure (LOLA) has been installed which streaks the beam according to the longitudinal distribution. Tests in the VUV-FEL yielded a rich substructure of the bunches. The most pronounced peak in the has a rms length of approximately 50 fs during FEL operation and below 20 fs FWHM at maximum compression. Depending on the transverse focusing a resolution between 10-50 fs was achieved.

  
   
THPP036 Measurement of Slice-Emmittance using Transverse Deflecting Structure 541
 
  • M. Roehrs, A. Bolzmann, M. Huening, H. Schlarb
    DESY, Hamburg
  • K. Honkavaara
    Uni HH, Hamburg
  
 

Among the very critical parameters for the operation of the VUV-FEL at DESY are the slice-emmittance and beam optics matching of the current peak in the electron bunch. Conventional tools for measuring the beam size are sensitive to the projected properties of the bunch only and hence suffer from mixing of different parts of the bunch. A combination of streaking with a transverse deflecting rf structure (LOLA) and a quadrupole scan allowed to measure the spike separate from the rest of the bunch. Indeed significant differences in terms of emmittance and optical functions have been found.