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

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...

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Detalles Bibliográficos
Autores principales: Hansson, M., Audet, T. L., Ekerfelt, H., Aurand, B., Gallardo Ganzalez, I., Desforges, F. G., Davoine, X., Maitrallain, A., Reymond, S., Monot, P., Persson, A., Dobosz Dufrénoy S., Wahlström C-G., Cros, B., Lundh, O.
Formato: info:eu-repo/semantics/article
Lenguaje:eng
Publicado: Plasma Phys. Control. Fusion 2016
Materias:
Acceso en línea:https://dx.doi.org/10.1088/0741-3335/58/5/055009
http://cds.cern.ch/record/2154828
Descripción
Sumario: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.