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Localization of ionization-induced trapping in a laser wakefield accelerator using a density down-ramp

Abstract : We report on a study on controlled trapping of electrons, by field ionization of nitrogen ions, in laser wakefield accelerators in variable length gas cells. In addition to ionization-induced trapping in the density plateau inside the cells, which results in wide, but stable, electron energy spectra, a regime of ionization-induced trapping localized in the density down-ramp at the exit of the gas cells, is found. The resulting electron energy spectra are peaked, with 10% shot-to-shot fluctuations in peak energy. Ionization-induced trapping of electrons in the density down-ramp is a way to trap and accelerate a large number of electrons, thus improving the efficiency of the laser-driven wakefield acceleration.
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https://hal-cea.archives-ouvertes.fr/cea-01426485
Contributor : Caroline Lebe <>
Submitted on : Wednesday, January 4, 2017 - 3:37:04 PM
Last modification on : Wednesday, September 16, 2020 - 4:46:31 PM

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M. Hansson, T. L. Audet, H. Ekerfelt, B. Aurand, I. Gallardo González, et al.. Localization of ionization-induced trapping in a laser wakefield accelerator using a density down-ramp. Plasma Physics and Controlled Fusion, IOP Publishing, 2016, 58 (5), pp.055009 ⟨10.1088/0741-3335/58/5/055009⟩. ⟨cea-01426485⟩

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