Electron-beam quality in free-electron lasers

  title={Electron-beam quality in free-electron lasers},
  author={C. W. Roberson and B. Hafizi},
Abstract The equilibrium electron-beam radius in a free-electron laser is determined by the emittance and focussing properties of the wiggler. The spot size of the radiation beam is determined by the optical guiding effects of the interaction. We have obtained a simple relationship connecting the beam emittance and the wavelength, with wiggler strength and current as parameters. Making use of the dispersion relation to define a scaled parallel thermal velocity, we then proceed to determine the… CONTINUE READING


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