Bremsstrahlung and line spectroscopy of warm dense aluminum plasma heated by xuv free-electron-laser radiation.
We report the creation of solid-density aluminum plasma using free-electron laser (FEL) radiation at 13.5nm wavelength. Ultrashort pulses were focused on a bulk Al target, yielding an intensity of 2x10;{14}Wcm;{2} . The radiation emitted from the plasma was measured using an xuv spectrometer. Bremsstrahlung and line intensity ratios yield consistent electron temperatures of about 38eV , supported by radiation hydrodynamics simulations. This shows that xuv FELs heat up plasmas volumetrically and homogeneously at warm-dense-matter conditions, which are accurately characterized by xuv spectroscopy.
Zastrau
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U
Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität, Max-Wien Platz 1, 07743 Jena, Germany. zastrau@ioq.uni-jena.de
Fortmann
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Fäustlin
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Cao
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Döppner
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Düsterer
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Glenzer
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Gregori
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Laarmann
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Lee
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Przystawik
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Radcliffe
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Reinholz
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Röpke
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Thiele
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Tiggesbäumker
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Truong
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Toleikis
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Uschmann
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Wierling
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Tschentscher
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Förster
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Redmer
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