Kiel 2004 – scientific programme

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P: Plasmaphysik

P 17: Postersitzung: Plasma-Wand-Wechselwirkung III, Grundlegende Probleme Theorie II, Schwerionen- Laserplasmen II, Dichte Plasmen II

P 17.30: Poster

Wednesday, March 10, 2004, 17:45–19:30, Foyer

Investigation of x-rays from laser-produced plasmas for scattering experiments — •M.S. Schollmeier¹, G. Rodriguez Príeto¹, F.B. Rosmej², A. Azima³, A. Blazevic¹, E. Brambrink¹, P. Pirzadeh¹, O.N. Rosmej¹, G. Schaumann¹, T. Schlegel¹, and D.H.H. Hoffmann¹ — ¹GSI - Darmstadt, Plasmaphysik, Germany — ²PIIMA, Université de Provence et CNRS, Marseille, France — ³Universität Heidelberg, Germany

For future investigations of warm dense matter (strongly coupled plasmas), there is a need for a new probing method, because conventional visible laser beams cannot penetrate the plasma due to the corresponding low critical electron density. One possibility is spectrally resolved x-ray scattering which can be realized by the kilojoule PHELIX laser-driven x-ray source at GSI, Darmstadt.
Spectrally resolved x-ray scattering potentially provides both electron density and temperature. The goal of this work is the investigation of the probe transition He_α with its underlying dielectronic satellite structure.
A plasma consisting of He-like chlorine ions was produced by the nhelix laser-beam (140 J, 14 ns) with pressed salt or PVC targets. The x-rays were spectrally dispersed using both a high-efficiency HOPG-crystal and a high-resolution spherically bent mica crystal. This allowed the calibration of the HOPG-crystal and the investigation of the influence of dielectronic satellites on the spectrum. The HOPG-crystal will be finally used to detect the backscattered radiation.