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Skew Quadrupole Effect of Laser Plasma Electron Beam Transport

1
Synchrotron SOLEIL, Saint-Aubin, 91192 Gif-sur-Yvette, France
2
Graduate School of Engineering, Osaka University, 2-8 Yamadaoka, Suita, Osaka 565-0871, Japan
3
Université Paris-Saclay, Doctoral School PHENIICS, 91190 Paris, France
4
CNRS, UMR 8523, PhLAM—Physique des Lasers Atomes et Molécules, Université Lille, F-59000 Lille, France
5
LOA, Ecole Polytechnique, ENSTA ParisTech, CNRS, Université Paris-Saclay, 826 Bd des Maréchaux, 91762 Palaiseau CEDEX, France
6
Departement of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 761001, Israel
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(12), 2447; https://doi.org/10.3390/app9122447
Received: 6 February 2019 / Revised: 27 May 2019 / Accepted: 10 June 2019 / Published: 14 June 2019
(This article belongs to the Special Issue Laser-Driven Particle Acceleration)
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Abstract

Laser plasma acceleration (LPA) capable of providing femtosecond and GeV electron beams in cm scale distances brings a high interest for different applications, such as free electron laser and future colliders. Nevertheless, LPA high divergence and energy spread require an initial strong focus to mitigate the chromatic effects. The reliability, in particular with the pointing fluctuations, sets a real challenge for the control of the dispersion along the electron beam transport. We examine here how the magnetic defects of the first strong quadrupoles, in particular, the skew terms, can affect the brightness of the transported electron beam, in the case of the COXINEL transport line, designed for manipulating the electron beam properties for a free electron laser application. We also show that the higher the initial beam divergence, the larger the degradation. Experimentally, after having implemented a beam pointing alignment compensation method enabling us to adjust the position and dispersion independently, we demonstrate that the presence of non-negligible skew quadrupolar components induces a transversal spread and tilt of the beam, leading to an emittance growth and brightness reduction. We are able to reproduce the measurements with beam transport simulations using the measured electron beam parameters. View Full-Text
Keywords: laser plasma acceleration; multipolar terms; magnetism; quadrupole; electron beam transport; free electron laser laser plasma acceleration; multipolar terms; magnetism; quadrupole; electron beam transport; free electron laser
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Oumbarek Espinos, D.; Ghaith, A.; André, T.; Kitégi, C.; Sebdaoui, M.; Loulergue, A.; Marteau, F.; Blache, F.; Valléau, M.; Labat, M.; Lestrade, A.; Roussel, E.; Thaury, C.; Corde, S.; Lambert, G.; Kononenko, O.; Goddet, J.-P.; Tafzi, A.; Malka, V.; Couprie, M.-E. Skew Quadrupole Effect of Laser Plasma Electron Beam Transport. Appl. Sci. 2019, 9, 2447.

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