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P: Plasmaphysik

P 14: Schwerionen- und lasererzeugte Plasmen 1

P 14.1: Talk

Tuesday, March 28, 2006, 14:45–15:00, 1004

Thomson scattering in VUV-FEL plasma experiments — •Robert Thiele, Carsten Fortmann, Arne Höll, Ronald Redmer, Heidi Reinholz, and Gerd Röpke — Universität Rostock, Institut für Physik, Universitätsplatz 3, 18055 Rostock

Photon scattering off charged plasma constituents provides an important insight into fundamental plasma properties. Thomson scattering has been established as a diagnostic tool to probe electronic density fluctuations in the plasma. High energetic photons in the 40 eV region with high brilliance as provided by a VUV–FEL, e.g. at DESY Hamburg, allow to investigate matter close to solid state densities. Our theoretical considerations will contribute to the development of future Thomson scattering experiments [1]. We describe the electronic density fluctuations by the dielectric function which is calculated in different approximations and related to the Thomson scattering cross section. It is shown that electron-ion collisions can yield significant corrections to the RPA scattering cross section at certain temperatures and densities [2]. Furthermore, a careful description of Bremsstrahlung as thermal background radiation is needed to discriminate it from the Thomson scattering signal.

[1] A. Höll, R. Redmer, G. Röpke and H. Reinholz, Eur. Phys. J. D 29, 159-162 (2004)

[2] H. Reinholz, R. Redmer, G. Röpke, A. Wierling, Phys. Rev. E 62, 5648 (2000)