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Selection of target elements for laser-produced plasma soft x-ray sources

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Abstract

We demonstrated the upper limitation to the number of shots, i.e., target lifetime, together with the number of photons emitted in the water-window soft x-ray spectral region from a number of targets used as sources in this spectral region, for multi-shot irradiation at the same position on the target surface. The spectra involved result from unresolved transition arrays originating from n=3n=4 transitions in medium-Z element plasmas and from n=4n=4 transitions originating in high-Z plasmas. The output flux was maintained for the highest number of shots in the case of the high melting point element molybdenum, and the total output in the water window was 7.7×1013photons/sr at a laser power density of 1.2×1014W/cm2.

© 2018 Optical Society of America

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