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Ionization injection effects in x-ray spectra generated by betatron oscillations in a laser wakefield accelerator

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  • K. T. Behm
  • T. Z. Zhao
  • J. M. Cole
  • A. Maksimchuk
  • S. P. D. Mangles
  • J. Nees
  • J. C. Wood
  • V. Yanovsky
  • K. Krushelnick
  • A. G. R. Thomas
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Article number055012
<mark>Journal publication date</mark>05/2016
<mark>Journal</mark>Plasma Physics and Controlled Fusion
Issue number5
Volume58
Number of pages8
StatePublished
Early online date30/03/16
Original languageEnglish

Abstract

Single photon counting techniques were used with an x-ray CCD camera to measure features of synchrotron-like x-ray spectra generated by betatron oscillations of electrons in a laser wakefield accelerator (LWFA) with different injection techniques. Measurements were made using the Hercules laser system at the University of Michigan. With a single stage gas cell, we demonstrate that pure helium gas in our wakefield accelerator will produce spectra with higher critical energies than when helium mixed with nitrogen is used. This result was not evident when a two stage gas cell was used.