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Characterization of transverse beam emittance of electrons from a laser-plasma wakefield accelerator in the bubble regime using betatron x-ray radiation

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  • S. Kneip
  • C. McGuffey
  • J. L. Martins
  • M. S. Bloom
  • V. Chvykov
  • F. Dollar
  • R. Fonseca
  • S. Jolly
  • G. Kalintchenko
  • K. Krushelnick
  • A. Maksimchuk
  • S. P. D. Mangles
  • Z. Najmudin
  • C. A. J. Palmer
  • K. Ta Phuoc
  • W. Schumaker
  • L. O. Silva
  • J. Vieira
  • V. Yanovsky
  • A. G. R. Thomas
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Article number021302
<mark>Journal publication date</mark>2/02/2012
<mark>Journal</mark>Physical Review Special Topics: Accelerators and Beams
Issue number2
Volume15
Number of pages5
<mark>State</mark>Published
<mark>Original language</mark>English

Abstract

We propose and use a technique to measure the transverse emittance of a laser-wakefield accelerated beam of relativistic electrons. The technique is based on the simultaneous measurements of the electron beam divergence given by v(perpendicular to)/v(parallel to), the measured spectrum gamma, and the transverse electron bunch size in the bubble r(perpendicular to). The latter is obtained via the measurement of the source size of the x rays emitted by the accelerating electron bunch in the bubble. We measure a normalized rms beam transverse emittance <0.5 pi mm mrad as an upper limit for a spatially Gaussian, spectrally quasimonoenergetic electron beam with 230 MeV energy in agreement with numerical modeling and analytic theory in the bubble regime.