Journal
PHYSICAL REVIEW LETTERS
Volume 111, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.235004
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Funding
- U.S. Department of Energy at UCLA [DE-AC52-07NA27344, DE-FG02-92-ER40727]
- Laboratory Directed Research and Development (LDRD) Program [13-LW-076]
- DOE Office of Science, Fusion Energy Sciences [FWP 100182]
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We present the first measurements of the angular dependence of the betatron x-ray spectrum produced by electrons inside the cavity of a laser-wakefield accelerator. Electrons accelerated up to 300 MeV energies produce a beam of broadband, forward-directed betatron x-ray radiation extending up to 80 keV. The angular resolved spectrum from an image plate-based spectrometer with differential filtering provides data in a single laser shot. The simultaneous spectral and spatial x-ray analysis allows for a three-dimensional reconstruction of electron trajectories with micrometer resolution, and we find that the angular dependence of the x-ray spectrum is showing strong evidence of anisotropic electron trajectories.
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