Control of electron injection and acceleration in Laser-Wakefield Accelerators

Abstract : Laser-plasma accelerators provide a promising compact alternative to conventional accelerators. Plasma waves with extremely strong electric fields are generated when a high intensity laser is focused into an underdense gas target. Electrons that are trapped in these laser-driven plasma waves can be accelerated up to energies of a few GeVs. Despite their great potential, laser-wakefield accelerators face some issues, regarding notably the stability and reproducibility of the beam when electrons are injected in the accelerating structure. In this manuscript, different techniques of electron injection are presented and compared, notably injection in a sharp density gradient and ionization injection. It is shown that combining these two methods allows for the generation of stable and tunable electron beams. We also studied a way to manipulate the electron bunch in the phase-space in order to accelerate the bunch beyond the dephasing limit. Such a technique was used with quasi-monoenergetic electron beams to enhance their energy. Moreover, the origin of the evolution of the angular momentum of electrons observed experimentally was investigated. Finally, we demonstrated experimentally a new method – the laser-plasma lens – to strongly reduce the divergence of the electron beam.
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https://hal-polytechnique.archives-ouvertes.fr/tel-01249964
Contributor : Emilien Guillaume <>
Submitted on : Monday, January 4, 2016 - 3:52:59 PM
Last modification on : Wednesday, July 3, 2019 - 10:48:02 AM

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Distributed under a Creative Commons Attribution - NonCommercial 4.0 International License

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  • HAL Id : tel-01249964, version 2

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Emilien Guillaume. Control of electron injection and acceleration in Laser-Wakefield Accelerators. Plasma Physics [physics.plasm-ph]. École Polytechnique, 2015. English. ⟨tel-01249964v2⟩

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