Emittance growth due to misalignment in multistage laser-plasma accelerators

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 quant...

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Bibliographic Details
Published in:Physical review. Accelerators and beams 2019-05, Vol.22 (5), p.051302, Article 051302
Main Authors: Thévenet, Maxence, Lehe, Rémi, Schroeder, Carl B., Benedetti, Carlo, Vay, Jean-Luc, Esarey, Eric, Leemans, Wim P.
Format: Article
Language:English
Subjects:
Electron beams
Emittance
Laser applications
Lasers
Misalignment
PARTICLE ACCELERATORS
Particle in cell technique
Plasma
Plasma accelerators
Tolerances
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Summary: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.
ISSN:2469-9888
2469-9888
DOI:10.1103/PhysRevAccelBeams.22.051302