Fig. 3: Multispectral COTR images of synthetic electron distributions. | Nature Photonics

Fig. 3: Multispectral COTR images of synthetic electron distributions.

From: Revealing the three-dimensional structure of microbunched plasma-wakefield-accelerated electron beams

Fig. 3

The left column shows the four electron distributions: width σ⊥ = 3 μm, length σz = 300 nm (row 1) and 400 nm (row 2) FWHM longitudinally Gaussian distributions; two 300 nm FWHM longitudinal Gaussians separated by 400 nm longitudinally and 6 μm transversely (row 3); a distribution with sinusoidal displacements along y and 800 nm period along z (row 4). Two-dimensional projections of each distribution are shown on the x–y, x–z and y–z planes. The total charge ratio is 1.0:1.0:1.0:1.1; electron energy, 285 MeV throughout. The remaining rows show the COTR images generated from the corresponding electron distribution at 400, 500, 600 and 800 nm with a collection angle of 0.28 mrad. The colour scale is consistent in each column, and normalized to the corresponding image in the first row.

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