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 inPhysical review. Accelerators and beams Vol. 22; no. 5; p. 051302
Main Authors Thévenet, Maxence, Lehe, Rémi, Schroeder, Carl B., Benedetti, Carlo, Vay, Jean-Luc, Esarey, Eric, Leemans, Wim P.
Format Journal Article
LanguageEnglish
Published College Park American Physical Society 28.05.2019
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.
Bibliography:AC02-05CH11231
USDOE Office of Science (SC), High Energy Physics (HEP)
ISSN:2469-9888
2469-9888
DOI:10.1103/PhysRevAccelBeams.22.051302