Layout of experimental setup showing diagnostic view angles relative to the nail-wire target axis.
emission from the nail-wire target shown with enhanced color scale.
for the nail-wire: experimental (connected dotted line), 1D numerical model fit to experimental data (dashed line), and 1D numerical model inferred total emission profile (before any temperature reduction) (solid line). The wire to nail head junction is at on the abscissa scale.
(a) XUV image (at 68 eV) of the nail-wire. Emission can be seen all along the nail-wire and even around the bend. Inset: schematic showing illumination geometry. (b) XUV image (at 256 eV emission) of the nail-wire. Dotted line denotes position of lineout in (c). Transverse lineout of wire in 256 eV XUV image which displays prominent limb brightening.
(a) E-PLAS hot electron density plot at 2 ps. (b) Lineouts of the transverse averages for (red), (blue), and (brown), as labeled in plot. The profile shows a near-exponential fall-off along the full length of the wire. The 1/e length from E-PLAS is .
(a) E-PLAS thermal (cold) electron contours at 2 ps. Plot displays enhanced surface heating along the edges of the target. (b) Lineouts of the temperature profiles at 2 ps for hot electrons (red), cold electrons (blue), and ions (brown). Beyond ( along the wire), both the cold electrons and the ions are at a similar temperature of 200 eV. (The target starts out with an initial temperature of 100 eV.) (c) Transverse average density profiles across the wire at . The hot electron density is seen to extend to a larger radius than the cold electron or ion densities. This correlates to the large flux of hot electrons surfing along the outside edge of the wire. (d) Transverse temperature profiles for the wire at . is seen to peak just at the edge of the wire.
(a) E-PLAS magnetic field contours at 2 ps. A strong B field is seen all around the nail head, confining electrons. (b) Axial profile of the magnetic field taken at . Fields are largest near the laser spot and along the wire surface near the head-wire interface. B field sign is generally positive, indicating that the dominant hot electron flow is away from the head, while return current lies just inside the wire surface.
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