Localization of ionization-induced trapping in a laser wakefield accelerator using a density down-ramp - Archive ouverte HAL Access content directly
Journal Articles Plasma Physics and Controlled Fusion Year : 2016

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

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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.

Dates and versions

cea-01426485 , version 1 (04-01-2017)

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Cite

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, 2016, 58 (5), pp.055009 ⟨10.1088/0741-3335/58/5/055009⟩. ⟨cea-01426485⟩
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