Laboratory measurements of hot iron opacities at EUV wavelengths

E. Wagenaars; L. M. R. Gartside; A. K. Rossall; N. Booth; S. White; C. L. S. Lewis; M. M. Notley; R. Heathcote; G. J. Tallents

doi:10.1117/12.825057

28 September 2009 Laboratory measurements of hot iron opacities at EUV wavelengths

E. Wagenaars, L. M. R. Gartside, A. K. Rossall, N. Booth, S. White, C. L. S. Lewis, M. M. Notley, R. Heathcote, G. J. Tallents

Author Affiliations +

Proceedings Volume 7451, Soft X-Ray Lasers and Applications VIII; 74510G (2009) https://doi.org/10.1117/12.825057
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

Abstract

The evolution of the transmission of extreme ultra-violet (EUV) light from a germanium backlighter through heated thin iron targets has been measured at laser irradiances of about 8×10¹⁶ W cm^-2. A rapid increase in transmission from 0 to 30% in 20 ps was observed. A two dimensional radiation hydrodynamics model was used to simulate the heating of the plasma and the transmission of EUV light as a function of time. The tamped iron targets were heated up to an average electron temperature of about 55 eV and a mass density of approximately 0.6 g cm^-3. The transmission measurements are in reasonable agreement with modelling results. The experimental layout is similar to an X-ray laser experiment and therefore, for relatively low plasma temperatures, these kinds of experiments can be done in combination with X-ray laser experiments, giving transmission data for a range of wavelengths rather than a single X-ray laser wavelength.

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E. Wagenaars, L. M. R. Gartside, A. K. Rossall, N. Booth, S. White, C. L. S. Lewis, M. M. Notley, R. Heathcote, and G. J. Tallents "Laboratory measurements of hot iron opacities at EUV wavelengths", Proc. SPIE 7451, Soft X-Ray Lasers and Applications VIII, 74510G (28 September 2009); https://doi.org/10.1117/12.825057

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KEYWORDS

Opacity

Iron

Extreme ultraviolet

Picosecond phenomena

Germanium

Plasma

X-ray lasers

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