Author: Marinelli, A.
Paper Title Page
TUEPPB011 Echo Enabled High Mode Generation for X-ray FELs 1140
  • E. Hemsing
    SLAC, Menlo Park, California, USA
  • A. Marinelli
    UCLA, Los Angeles, California, USA
  Funding: Work supported by U.S. DOE under Contract Nos. DE-AC02-76SF00515 and DE-FG02-07ER46272.
We describe a simple technique based on a modified echo-enabled harmonic generation (EEHG) scheme to manipulate the three-dimensional electron beam microbunching distribution in order to generate higher-order optical modes in an FEL. As with EEHG, the concept uses two modulators and two chicanes to produce microbunching. However, in one of the modulators, the resonant interaction with the laser has a well-defined transverse structure that becomes strongly correlated to the longitudinal microbunching distribution. Both high-harmonic frequencies and high transverse mode numbers can be generated through a transversely-dependent echo effect.