Controlling the spectrum of x-rays generated in a laser-plasma accelerator by tailoring the laser wavefront

S. P. D. Mangles, Guillaume Genoud, S. Kneip, Matthias Burza, K. Cassou, B. Cros, N. P. Dover, Christos Kamperidis, Z. Najmudin, Anders Persson, J. Schreiber, F. Wojda, Claes-Göran Wahlström

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By tailoring the wavefront of the laser pulse used in a laser-wakefield accelerator, we show that the properties of the x-rays produced due to the electron beam's betatron oscillations in the plasma can be controlled. By creating a wavefront with coma, we find that the critical energy of the synchrotronlike x-ray spectrum can be significantly increased. The coma does not substantially change the energy of the electron beam, but does increase its divergence and produces an energy-dependent exit angle, indicating that changes in the x-ray spectrum are due to an increase in the electron beam's oscillation amplitude within the wakefield.
Original languageEnglish
Article number181106
JournalApplied Physics Letters
Issue number18
Publication statusPublished - 2009

Bibliographical note

Copyright (2009) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

Subject classification (UKÄ)

  • Atom and Molecular Physics and Optics


  • accelerators
  • wakefield
  • plasma X-ray sources
  • betatrons
  • plasma accelerators


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