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Multi-keV x-ray generation from low-density (27±7mg∕cm3) nanofiber-cotton targets composed of titanium dioxide has been investigated. The cotton targets were heated volumetrically and supersonically to a peak electron temperature of 2.3keV, which is optimal to yield Ti K-shell x rays. Considerable enhancement of conversion efficiency [(3.7±0.5)%] from incident laser energy into Ti K-shell x rays (4–6keV band) was attained in comparison with that [(1.4±0.9)%] for a planar Ti-foil target.
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Tanabe et al. (2008) studied this question.
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