Abstract
Thickness variation of visually opaque foils used as x-ray and ultraviolet (XUV) photon filters and photocathodes can introduce anomalies in recorded intensities, images, and spectral line profiles. In laser fusion studies, mass thickness variations of laser-accelerated foils can hydrodynamically disrupt their motion. We have used transmitted electrons to obtain quantitative local (area ≤1 μm2) measurements of mass thickness as well as qualitative images of mass thickness variations in free-standing Be, C, and Al foils presently in use in the above areas of investigation. Substantial mass thickness variations, up to a factor of 4 for Al and 1.3 for Be, were found which can produce considerable modulations in transmitted XUV photon intensity.
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