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P: Fachverband Plasmaphysik

P 15: Poster: Diagnostik

P 15.21: Poster

Wednesday, April 1, 2009, 17:30–19:30, Foyer des IfP

Plasma diagnostics applying K-line emission profiles — •Andrea Sengebusch, Heidi Reinholz, and Gerd Röpke — Universitätsplatz 1 18051 Rostock

In recent years K-line spectra have become the focus of various experiments. Narrow K_α-emission of some keV is an appropriate light scource for Thomson scattering on warm dense matter. Moreover, as the K-spectra are often emitted from a warm dense plasma themselves one can infer plasma parameters, i.e. temperature, density and composition, by studying variations of line energy and line shape [1]. There is a large variety of effects influencing the line profile, e.g. Doppler-broadening, self-absorption and satellite transitions. Electric and magnetic fields have also a strong impact. We will focus here on the influence of plasma polarization effects on the K-line emission. A theoretical treatment of spectral line profiles using a self-consistent ion sphere model is applied on moderately ionized mid-Z materials. We calculated titanium K_α-spectra in order to analyze recent measurements with respect to the plasma parameters of electron heated target regions [2]. The radial temperature profile of the created plasma is inferred. It is shown that important contributions to the line profiles are due to excited radiator states. Besides, various competing line broadening mechanisms are considered [3].

[1] A. Sengebusch, S. H. Glenzer, et al., Contrib. Plasma Phys. 47, 309 (2007). [2] A. Sengebusch, H. Reinholz, G. Röpke, et al., J. Phys. A: Math. Theor. 42 (2009), submitted. [3] E. Stambulchik, V. Bernshtam, et al., J. Phys. A: Math. Theor. 42 (2009), in press.