Target geometry schematics (a) without or (b) with a gold cone attached to the target edge. Corresponding photographs are given on the right-hand-side.
Side-view x-ray image of a target without cone, raw (a), or reshaped (b). The arrow indicates the incoming laser direction.
Typical images obtained without [(a) and (b)] or with [(c) and (d)] cone. (b) and (d) correspond to the smaller targets. The laser comes from the left-hand side and the color scale is in arbitrary units, although identical for all the displayed images.
Illustration of the two different methods to analyze the same data, (a) as in layered targets experiments and (b) as in the present report.
Results of the images analysis. The red squares and yellow triangles designate, respectively, the targets without and with cones.
Measured electron spectrum (gray area). The dashed line is the input spectrum used in Sec. V.
Simulated images (a) without preplasma, (b) with a preplasma, and (c) with a preplasma. The input half-opening divergence angle is .
Simulated fraction of the emission produced by electrons initially faster than 1 MeV.
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