Analysis of Electron Injection in Laser Wakefield Acceleration Using Betatron Emission in Capillary Tubes

F. G. Desforges, B. S. Paradkar, Martin Hansson, T. L. Audet, J. Ju, Isabel Gallardo Gonzalez, Bastian Aurand, P. Lee, Lovisa Senje, A. Persson, S. Dobosz Dufrenoy, Olle Lundh, G. Maynard, P. Monot, J. L. Vay, Claes-Göran Wahlström, B. Cros

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceedingpeer-review

Abstract

The dynamics of ionization-induced electron injection in the high density (similar to 1.2 x 10(19)cm(-3)) regime of Laser Wakefield Acceleration (LWFA) was investigated by analyzing betatron X-ray emission inside dielectric capillary tubes. A comparative study of the electron and betatron X-ray properties was performed for both self-injection and ionization-induced injection. Direct experimental evidence of early onset of ionization-induced injection into the plasma wave was obtained by mapping the X-ray emission zone inside the plasma. Particle-In-Cell (PIC) simulations showed that the early onset of ionization-induced injection, due to its lower trapping threshold, suppresses self-injection of electrons. An increase of X-ray fluence by at least a factor of two was observed in the case of ionization-induced injection due to an increased trapped charge compared to self-injection mechanism.
Original languageEnglish
Title of host publicationLaser Acceleration of Electrons, Protons, and Ions III; and Medical Applications of Laser-Generated Beams of Particles III
PublisherSPIE
Pages95140Z
Volume9514
DOIs
Publication statusPublished - 2015
EventConference on Laser Acceleration of Electrons, Protons, and Ions III; and Medical Applications of Laser-Generated Beams of Particles III - Prague, CZECH REPUBLIC
Duration: 2015 Apr 132015 Apr 15

Publication series

Name
Volume9514
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceConference on Laser Acceleration of Electrons, Protons, and Ions III; and Medical Applications of Laser-Generated Beams of Particles III
Period2015/04/132015/04/15

Subject classification (UKÄ)

  • Atom and Molecular Physics and Optics

Free keywords

  • Laser-wakefield acceleration
  • betatron radiation
  • self-injection
  • ionization-induced injection

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