X-ray imaging to characterize MeV electronics propagation through plastic targets Page: 5 of 7
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Figure 1: Schematic of target foil with two hi-Z tracer layers embedded in CH. It is viewed from behind,
with the laser impinging on the far side. The tracer layers are thin enough to be partially transparent, so
both spots can be seen by the x-ray camera.l
It has in fact proved possible to look at the beam structure by adding a 0.5 pm gold or
aluminum tracer layer buried under a CH surface. Koch et al  have demonstrated that
the passage of high energy particles through the film deposits energy (either directly or
through the associated return current) which heats the film sufficiently to be visible
through >100 pm of CH.
Figure 2: x-ray image from the back of a 100 pm CH foil backed with 0.5 pm Au / 5 CH, and viewed
through 100 pm CH filter in addition to the standard 1pm Be foil. (#29041209) A CH foil without a hi-Z
layer does not show any image.
So one can set up the geometry shown in Figure 1. A foil with two tracer layers, one near
the front of a foil, and one near the back, would give images which are self referencing.
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Key, M H; Stephens, R B; Koch, J & Pennington, D. X-ray imaging to characterize MeV electronics propagation through plastic targets, article, September 3, 1999; California. (https://digital.library.unt.edu/ark:/67531/metadc623302/m1/5/: accessed March 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.