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Refraction-enhanced x-ray radiography for inertial confinement fusion and laser-produced plasma applications
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10.1063/1.3133092
/content/aip/journal/jap/105/11/10.1063/1.3133092
http://aip.metastore.ingenta.com/content/aip/journal/jap/105/11/10.1063/1.3133092
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Sketch illustrating wave and ray propagation through a tilted slit in front of a block of material with index . Simulated intensity profiles at the back of the block are shown at right for Fresnel diffraction (oscillatory curve) and geometrical optics (sharp-edged curve).

Image of FIG. 2.
FIG. 2.

Intensity profile of a radiographed sine-wave surface perturbation in a plastic substrate with , , and and various values of amplitude and period compared to the analytical predictions from Eq. (8).

Image of FIG. 3.
FIG. 3.

Intensity profile of a radiographed cusp surface perturbation in a plastic substrate with , , and and various values of amplitude and half-width compared to the analytical predictions from Eq. (12).

Image of FIG. 4.
FIG. 4.

Refraction geometry for the case of a sphere having index that is greater than the outside index .

Image of FIG. 5.
FIG. 5.

Signal in units of vs projected image impact parameter in units of , setting for convenience .

Image of FIG. 6.
FIG. 6.

Refraction geometry for the case of a sphere having index that is less than the outside index .

Image of FIG. 7.
FIG. 7.

Signal in units of vs projected image impact parameter in units of , setting for convenience .

Image of FIG. 8.
FIG. 8.

Simulated radiograph of a section of a Be shell. The x-ray energy is , the shell outer diameter is , the shell thickness is , and the source and detector distances are 75 and .

Image of FIG. 9.
FIG. 9.

Calculated inner dark band width (a), and outer dark band and outer peak widths (b) for the image in Fig. 8 [eqs. (19)–(21)] compared to raytrace simulations.

Image of FIG. 10.
FIG. 10.

Comparison of a radiograph of a bumpy solid sphere (a) with a simulated raytrace radiograph of a bumpy sphere having a comparable surface power spectrum and ∼ micrometer-scale peak-to-valley heights, generated with a raytracing code (b).

Image of FIG. 11.
FIG. 11.

-diameter plastic shell radiographed at low-magnification onto x-ray film by a Au laser-produced plasma backlight emitting primarily -band radiation near . The edge enhancements are due to refraction.

Image of FIG. 12.
FIG. 12.

Geometry of beam steering in a density gradient. The ray with initial impact parameter is incident from the left and is deflected by a total angle .

Image of FIG. 13.
FIG. 13.

Simulated density gradient in a NIF implosion of a Be shell surrounding a shell of solid DT fuel at a time when the shell has converged by a factor of . Annular regions of the shell are doped with Cu, and regions as well as the shell/ice interface are visible in the density profile.

Image of FIG. 14.
FIG. 14.

Deflection angle and density vs radius for the density profile shown in Fig. 13. The shell/ice interface and the Cu-doped regions cause changes in the beam deflections, and these deflections will affect radiographs.

Image of FIG. 15.
FIG. 15.

Simulated radiographs through the density profile in Fig. 13 for different values of . The dark band arises from the shell/ice interface and fills in from refractive blurring as increases, while the Cu-doped Be zones eventually give rise to bright bands.

Image of FIG. 16.
FIG. 16.

Simulated radiographs through the density profile in Fig. 13 for different larger values of . The wide dark band that eventually emerges as increases is caused by the entire shell, and all fine structures are lost to refractive blurring. This is also reproduced by a diffraction calculation (bottom).

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/content/aip/journal/jap/105/11/10.1063/1.3133092
2009-06-04
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Refraction-enhanced x-ray radiography for inertial confinement fusion and laser-produced plasma applications
http://aip.metastore.ingenta.com/content/aip/journal/jap/105/11/10.1063/1.3133092
10.1063/1.3133092
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