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SLAC Publication: SLAC-PUB-17107
SLAC Release Date: August 7, 2017
Sensitivity of Echo Enabled Harmonic Generation to Sinusoidal Electron Beam Energy Structure
Hemsing, Erik.
We analytically examine the bunching factor spectrum of a relativistic electron beam with sinusoidal energy structure that then undergoes an echo-enabled harmonic generation (EEHG) transformation to produce high harmonics. The performance is found to be described primarily by a simple scaling parameter. The dependence of the bunching amplitude on fluctuations of critical parameters is derived analytically, and compared with simulations. Where applicable, EEHG is also compared with high gain harm... Show Full Abstract
We analytically examine the bunching factor spectrum of a relativistic electron beam with sinusoidal energy structure that then undergoes an echo-enabled harmonic generation (EEHG) transformation to produce high harmonics. The performance is found to be described primarily by a simple scaling parameter. The dependence of the bunching amplitude on fluctuations of critical parameters is derived analytically, and compared with simulations. Where applicable, EEHG is also compared with high gain harmonic generation (HGHG) and we find that EEHG is generaly less sensitive to several types of energy structure. In the presence of intermediate frequency modulations like those produced by the microbunching instability, EEHG is also found to lead to a cleaner bunching spectrum with substantially narrower intrinsic pedestal. Show Partial Abstract
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  • Interest Categories: Accelerator Physics, X-Ray Free Electron Laser