Diagram of pinhole-assisted point-projection backlighter geometry.
Diagram of the experimental target. The backlighter foil, the “primary” pinhole, and the “secondary” pinhole are all mounted on edge to a polycarbonate base (not shown). The W wire sets are shown as a set of three dots in the diagram.
Time-streaked images of a shadow produced with the diameter “primary” pinhole (A) and the diameter “reference” pinhole (B). Time is shown vertically and lighter pixel shade indicates higher x-ray fluence. Here, the pinhole was placed away from the backlighter, and the pinhole was placed away from the pinhole.
pinhole transmission for pinhole-to-backlighter distances of both (open squares) and (closed circles).
(open circles) and (closed squares) pinhole transmissions for pinholes placed away from the backlighter.
Measured lineout and fitted resolution for (a) 5, (b) 10, and (c) pinhole images of wire. Data separated along the axis. Top data taken at by a pinhole placed away from the backlighter is best fit using a pinhole resolution. Middle data taken at by a pinhole placed away from the backlighter is best fit using a pinhole resolution. Bottom data taken at by a pinhole away is best fit using a pinhole resolution.
pinhole transmission (closed circles) and resolution (open squares) for pinhole-to-backlighter distances of . Solid line is calculated resolution assuming pinhole closes as hard aperture based on measured transmissions.
Diagram of pinhole closure geometry for HYADES simulations. (a) X-ray driven pinhole ablation is simulated in a small region, . (b) The simulation calculates density as a function of distance from the surface in a cylindrical geometry, which is equivalent to density as a function of radius. (c) The depth of x-ray heating is controlled by the mean free path of x rays in Ta and the average angle of incidence for the x rays.
Transmission of pinhole at to backlighter, with (open circles) and without (closed squares) Be between Ti and pinhole.
Plot of HYADES-calculated Ta density (dashed line) and ion temperature (solid line) as a function of radius inside pinhole at the time at which the spatially averaged pinhole transmission is 50%.
Measured (symbols) and corrected, hard x-ray only HYADES simulation (curves) of transmission for pinhole at (open circles and solid line) and (closed squares and dashed line) from Ti backlighter.
Measured (symbols) and corrected, hard x-ray only HYADES simulation (curves) of transmission and resolution for pinhole at from Ti backlighter.
(open circles) and (closed circles) slit transmissions for slits placed away from the backlighter.
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