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Borden, T.

Paper Title Page
FRPMS071 Relative Bunch Length Monitor for the Linac Coherent Light Source (LCLS) using Coherent Edge Radiation 4189
 
  • H. Loos, T. Borden, P. Emma, J. C. Frisch, J. Wu
    SLAC, Menlo Park, California
  
  Funding: This work was supported by U. S. Department of Energy, Office of Basic Energy Sciences, under Contract DE-AC03-76SF00515

The ultra-short bunches of the electron beam for LCLS are generated in two 4-dipole bunch compressors located at energies of 250 MeV and 4.3 GeV. Although an absolute measurement of the bunch length can be done by using a transverse deflecting cavity in an interceptive mode, a non-interceptive single shot method is needed as a relative measurement of the bunch length used in the continuous feedback for beam energy and peak current. We report on the design and implementation of two monitors measuring the integrated power of coherent edge radiation from the last dipole in each chicane. The first monitor is installed in early 2007 and we compare its performance with the transverse cavity measurement and other techniques.