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Abstract
The original version of this Article contained an error in the last sentence of the first paragraph of the Introduction and incorrectly read ‘A proper electron beam control is one of the main challenges towards the Graal of developing a compact alternative of X-ray free-electron lasers by coupling LWFA gigaelectron-volts per centimetre acceleration gradient with undulators in the amplification regime in equation 11, nx(n-β) x β: n the two times and beta the two times should be bold since they are vectorsin Eq. 12, β should be bold as well.’ The correct version is ‘A proper electron beam control is one of the main challenges towards the Graal of developing a compact alternative of X-ray free-electron lasers by coupling LWFA gigaelectron-volts per centimetre acceleration gradient with undulators in the amplification regime.’This has been corrected in both the PDF and HTML versions of the Article.
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1 Synchrotron-SOLEIL, Saint-Aubin, France; Université Paris-Saclay, Paris, France
2 Synchrotron-SOLEIL, Saint-Aubin, France
3 Synchrotron-SOLEIL, Saint-Aubin, France; PhLAM, UMR CNRS 8523, Université Lille 1, Sciences et Technologies, Villeneuve d’Ascq, France
4 LOA, École polytechnique, ENSTA ParisTech, CNRS, Université Paris-Saclay, Palaiseau Cedex, France
5 LOA, École polytechnique, ENSTA ParisTech, CNRS, Université Paris-Saclay, Palaiseau Cedex, France; Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot, Israel
6 PhLAM, UMR CNRS 8523, Université Lille 1, Sciences et Technologies, Villeneuve d’Ascq, France