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Emittance growth due to misalignment in multistage laser-plasma accelerators

  • Author(s): Thévenet, M;
  • Lehe, R;
  • Schroeder, CB;
  • Benedetti, C;
  • Vay, JL;
  • Esarey, E;
  • Leemans, WP
  • et al.
Abstract

Beam degradation is examined in a laser-plasma accelerator stage with a parabolic plasma channel when the laser pulse and/or the electron beam enters the channel off axis. Betatron oscillations in the beam become incoherent, resulting in a net increase of beam emittance through phase mixing. A quantitative model for transverse emittance growth due to misalignment in multistage accelerators, valid in the linear regime, is presented and compared with particle-in-cell simulations. The model is applied to a chain of laser-plasma accelerator stages, and tolerances are derived on the initial energy spread of the electron beam and misalignment in the multistage structure, with repercussions in high-energy physics applications of laser-plasma accelerators.

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