Scanning electron micrograph of a copper nanobrush target (a), schematic overview of the experimental setup (b), and a typical x-ray energy spectrum observed in the experiments (c).
X-ray spot images taken from the front and back surfaces of a nanobrush target [(a) and (b)] and a plane target [(c) and (d)]. The upper frames are raw x-ray emission images from the experiments and the bottom frames are the emission intensity profiles extracted from the original images. In the front of a nanobrush target with FWHM (a), at the rear side of a nanobrush target with FWHM (b), in the front side of a plane target with FWHM (c), and at the rear side of a plane target with FWHM (d).
(a) Model of the nanobrush target. (b) Distributions of the electric field , normalized by . (c) Electron energy in MeV vs the longitudinal momentum , normalized by . (d) Energy spectrum of the forward electrons for the nanobrush target (dashed line) and planar target (solid line) of thickness of . (e) Electron energy density, normalized by , at , and (f) electron energy density at . The forward and backward moving electrons in (c) are also shown as solid circles and hollow triangles, respectively.
The scheme of a nanobrush target with an exponential preplasma at the front of the surface for 2D3V PIC simulations (a), the distributions of the electric field (b), electron phase space for forward ( in solid circles) and backward ( in hollow triangles) moving electrons (c), and the electron energy density (d) at .
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