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(a) The schematic of the experimental setup. Coordinates used in the experiment and simulation are also indicated. The angular distribution of energetic electrons is measured with a radiochromic film stack placed 50 mm behind the target. (b) The emission image of electrons detected by a HD-810 film. (c) The emission image of electrons detected by a MD-55 film. The electron emission images are photonegative images with a pixel dimension of . The colors in the figure represent the radiation dose of energetic electrons.
The distributions of axial current density, electron density, and electromagnetic fields snapped at . (a) The longitudinal current . (b) The radial electric field . (c) The azimuthal magnetic field . (d) The transverse strength profiles of electron density (magenta line) and (blue line) and (red line) at . The fields are normalized to the incident laser amplitude and . The dash dot lines indicate the initial outer and inner wall surface positions.
The longitudinal distributions of the electron density, current density and electromagnetic fields at the inner wall surfaces B and C at and , respectively. (a) The electron density at . (b) The spatial-averaged radial current density (in unit of ) in the region between interfaces B and C. (c) The radial electric fields. (d) The surface magnetic fields.
Divergence angle and energy spectra distributions for the forward electrons in the CNTs array and in the foil target at . (a) Divergence angular distributions of all the forward electrons and the high-energy electrons ( and ). (b) The electron energy spectra in both cases.
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