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Numerical Simulations of Early-Stage Dynamics of Electron Bunches Emitted from Plasmonic Photocathodes

Authors
  • Lueangaramwong, Anusorn
  • Mihalcea, Daniel
  • Andonian, Gerard
  • Piot, Philippe
Type
Preprint
Publication Date
Jun 16, 2016
Submission Date
Jun 16, 2016
Identifiers
arXiv ID: 1606.05383
Source
arXiv
License
Yellow
External links

Abstract

High-brightness electron sources are a key ingredient to the development of compact accelerator-based light sources. The electron sources are commonly based on (linear) a photoemission process where a laser pulse with proper wavelength impinges on the surface of a metallic or semiconductor cathode. Very recently the use of plasmonic cathodes--cathodes with a nano-patterned surface--have demonstrated great enhancement in quantum efficiencies [1]. Alternatively, this cathode type could support the formation of structured beams composed of transversely separated beamlets. In this paper we discuss numerical simulations of the early-stage beam dynamics of the emission process from plasmonic cathodes using the Warp [2] framework. The model is used to investigate the properties of beams emitted from this type of cathode and combined with PIC simulation to explore the imaging of cathode pattern after acceleration in a radiofrequency gun.

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