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

M. Hansson, T. L. Audet, H. Ekerfelt, B. Aurand, I. Gallardo González, F. G. Desforges, X. Davoine, A. Maitrallain, S. Reymond, P. Monot, Anders Persson, S. Dobosz Dufrénoy, C. G. Wahlström, B. Cros, O. Lundh

Research output: Contribution to journalArticlepeer-review

11 Citations (SciVal)

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.

Original languageEnglish
Article number055009
JournalPlasma Physics and Controlled Fusion
Volume58
Issue number5
DOIs
Publication statusPublished - 2016 Mar 23

Subject classification (UKÄ)

  • Atom and Molecular Physics and Optics

Keywords

  • down-ramp
  • ionization
  • laser
  • trapping
  • wakefield

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