A simple method of generating multi-keV, monochromatic, twin x-ray point sources based on laser-driven vacuum diode is presented. Electrons from a laser-produced aluminum plasma cathode were accelerated towards two point-tip titanium anodes placed symmetrically with respect to the cathode. Temporal and spatial characterizations of the K-shell x-ray emission from the twin anodes are carried out. Each source (similar to 300 mu m diameter) emits similar to 10(9) Ti K alpha (h nu approximate to 4.51 keV) photons in a pulse of similar to 20 ns duration with a peak brightness of similar to 4 x 10(18) photons/cm(2) s sr. Single-shot twin x-ray shadowgrams of physical objects were recorded at a distance of several centimeters from the two sources. Such a system may be useful for single-shot stereoradiography for differential imaging in the multi-keV energy region. (c) 2005 American Institute of Physics.
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