Dynamics of ionization-induced electron injection in the high density regime of laser wakefield acceleration

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The dynamics of ionization-induced electron injection in high density (similar to 1.2 x 10(19) cm(-3)) regime of laser wakefield acceleration is investigated by analyzing the betatron X-ray emission. In such high density operation, the laser normalized vector potential exceeds the injection-thresholds of both ionization-injection and self-injection due to self-focusing. In this regime, direct experimental evidence of early on-set of ionization-induced injection into the plasma wave is given by mapping the X-ray emission zone inside the plasma. Particle-In-Cell simulations show that this early on-set of ionization-induced injection, due to its lower trapping threshold, suppresses the trapping of self-injected electrons. A comparative study of the electron and X-ray properties is performed for both self-injection and ionization-induced injection. An increase of X-ray fluence by at least a factor of two is observed in the case of ionization-induced injection due to increased trapped charge compared to self-injection mechanism. (C) 2014 AIP Publishing LLC.


  • F. G. Desforges
  • B. S. Paradkar
  • Magnus Hansson
  • J. Ju
  • Lovisa Senje
  • T. L. Audet
  • A. Persson
  • S. Dobosz-Dufrenoy
  • Olle Lundh
  • G. Maynard
  • P. Monot
  • J. -L. Vay
  • Claes-Göran Wahlström
  • B. Cros
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Atom and Molecular Physics and Optics
Original languageEnglish
Article number120703
JournalPhysics of Plasmas
Issue number12
Publication statusPublished - 2014
Publication categoryResearch