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The calculated magnification vs energy from . The magnification varies between 780 and 110 for the x-ray energy range due to the focal length of zone plate changes with the x-ray energy. To minimize variation of the image magnification and focal length variation, three zone plates with different diameters are used. Furthermore, it is desirable to choose the same magnification for different energy to do the image subtraction under and above the absorption edge.
(a) (Color) 3D rendering of tungsten plug with a keyhole and the diagrams showing the structure of the keyhole (right to) and the tungsten plug with a diam. (Right bottom) The tungsten plug with a diameter. (b) The 3D rendering of the tungsten plug is plotted with higher threshold. The wire made of a copper-aluminum alloy is removed from the rendering; the tungsten distribution is shown. The red region of the left picture is the region of the right picture. The red region in the right picture is the tungsten plug, which is analyzed in (c). (c) The top view and side view of the tungsten plug displayed in a voxel mode (top) and an isosurface (bottom) mode. The orange line indicates the region of the cross-section plot that is shown in Fig. 3. (d) The measurement of the size of the keyhole. The diameters of the keyhole range from .
(Color) The cross-section plot of the orange line in Fig. 2. The resolution is estimated and is near .
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