Author: Maier, A.R.
Paper Title Page
THOC3
 Few-fs X-ray Pulse Length Measurement at LCLS  
 
  • A.R. Maier, F. Grüner
    LMU, Garching, Germany
  • J.D. Bozek, R.N. Coffee
    SLAC, Menlo Park, California, USA
  • A.L. Cavalieri, I. Grguras
    CFEL, Hamburg, Germany
  • J.T. Costello
    DCU, Dublin, Republic of Ireland
  • G. Doumy
    ANL, Argonne, USA
  • S. Düsterer
    DESY, Hamburg, Germany
  • J. Gagnon, W. Helml, R. Kienberger, W. Schweinberger, V.S. Yakovlev
    MPQ, Garching, Munich, Germany
  • M. Meyer, P. Radcliffe, T. Tschentscher
    European XFEL GmbH, Hamburg, Germany
  • C. Roedig
    Ohio State University, USA
  
  The Linac Coherent Light Source (LCLS) has an unique operating mode, delivering X-ray pulses of only a few femtoseconds (fs) length, though so far the precise X-ray pulse length has been experimentally inaccessible. In a recent experiment we measured the LCLS pulse length in this regime to be 4 fs fwhm by overlapping the FEL pulse with an optical infrared laser in a Neon gas jet. The IR laser maps the temporal X-ray pulse profile into the energy spectrum of the generated photolectrons. By measuring the photoelectron spectrum a direct characterization of the FEL pulse is possible. In the experiment we were able to directly access the temporal substructure of the X-ray pulses, measured the typical pulse length in the LCLS low charge mode to be 4 fs fwhm and showed single-spike, single-fs X-ray pulses.  
slides icon Slides THOC3 [2.818 MB]