Temperature and Kalpha-yield radial distributions in laser-produced solid-density plasmas imaged with ultrahigh-resolution x-ray spectroscopy.
We study warm dense matter formed by subpicosecond laser irradiation at several 10(19) W/cm(2) of thin Ti foils using x-ray spectroscopy with high spectral (E/DeltaE approximately 15,000) and one-dimensional spatial (Deltax=13.5 microm) resolutions. Ti Kalpha doublets modeled by line-shape calculations are compared with Abel-inverted single-pulse experimental spectra and provide radial distributions of the bulk-electron temperature and the absolute-photon number Kalpha yield in the target interiors. A core with approximately 40 eV extends homogeneously up to ten times the laser-focus size. The spatial distributions of the bulk-electron temperature and Kalpha yield are strongly correlated.
Zastrau
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Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität, Max-Wien-Platz 1, 07743 Jena, Germany. ulf.zastrau@uni-jena.de
Audebert
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P
Bernshtam
V
V
Brambrink
E
E
Kämpfer
T
T
Kroupp
E
E
Loetzsch
R
R
Maron
Y
Y
Ralchenko
Yu
Y
Reinholz
H
H
Röpke
G
G
Sengebusch
A
A
Stambulchik
E
E
Uschmann
I
I
Weingarten
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L
Förster
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E