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Limborg, C.

Paper Title Page
TUP53 Temporal Profile of the LCLS Photocathode Ultraviolet Drive Laser Tolerated by the Microbunching Instability 390
 
  • J. Wu, Z. Huang
    SLAC, Menlo Park, California
  • M. Borland
    ANL, Argonne, Illinois
  • P. Emma
    SLAC/ARDA, Menlo Park, California
  • C. Limborg
    SLAC/SSRL, Menlo Park, California
  
  The high quality LCLS electron beam generated in the photoinjector is subject to all possible instabilities in the downstream acceleration and compression. The instability can be initiated by any possible density modulation of the electron beam when it is generated at the photocathode. In this note, we prescribe the tolerance on the initial electron beam density modulation possibly introduced by the ultraviolet (uv) laser at the cathode. Our study shows that the initial rms density modulation of the electron beam at the photocathode shall be less than 5 % to ensure the FEL lasing and saturation.