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X-ray induced pinhole closure in point-projection x-ray radiography
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10.1063/1.2229737
/content/aip/journal/jap/100/4/10.1063/1.2229737
http://aip.metastore.ingenta.com/content/aip/journal/jap/100/4/10.1063/1.2229737
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Diagram of pinhole-assisted point-projection backlighter geometry.

Image of FIG. 2.
FIG. 2.

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.

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

pinhole transmission for pinhole-to-backlighter distances of both (open squares) and (closed circles).

Image of FIG. 5.
FIG. 5.

(open circles) and (closed squares) pinhole transmissions for pinholes placed away from the backlighter.

Image of FIG. 6.
FIG. 6.

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.

Image of FIG. 7.
FIG. 7.

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.

Image of FIG. 8.
FIG. 8.

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.

Image of FIG. 9.
FIG. 9.

Transmission of pinhole at to backlighter, with (open circles) and without (closed squares) Be between Ti and pinhole.

Image of FIG. 10.
FIG. 10.

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%.

Image of FIG. 11.
FIG. 11.

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.

Image of FIG. 12.
FIG. 12.

Measured (symbols) and corrected, hard x-ray only HYADES simulation (curves) of transmission and resolution for pinhole at from Ti backlighter.

Image of FIG. 13.
FIG. 13.

(open circles) and (closed circles) slit transmissions for slits placed away from the backlighter.

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/content/aip/journal/jap/100/4/10.1063/1.2229737
2006-08-18
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: X-ray induced pinhole closure in point-projection x-ray radiography
http://aip.metastore.ingenta.com/content/aip/journal/jap/100/4/10.1063/1.2229737
10.1063/1.2229737
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