Angular Dependence of Betatron X-Ray Spectra from a Laser-Wakefield Accelerator

作者：Albert F^*; Pollock B B; Shaw J L; Marsh K A; Ralph J E; Chen Y H; Alessi D; Pak A; Clayton C E; Glenzer S H; Joshi C

来源：Physical Review Letters, 2013, 111(23): 235004.

DOI：10.1103/PhysRevLett.111.235004

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.

• 出版日期2013-12-4