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DPG

Berlin 2005 – scientific programme

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P: Plasmaphysik

P 25: Dichte Plasmen 2

P 25.4: Talk

Wednesday, March 9, 2005, 12:00–12:15, HU 3059

Thomson scattering using the VUV-FEL at DESY Hamburg — •Robert Thiele1, Eckhart Förster2, Ronald Redmer1, Heidi Reinholz1, Gerd Röpke1, and Thomas Tschentscher31Universität Rostock — 2Friedrich-Schiller-Universität Jena — 3DESY Hamburg

The scattering of photons in plasmas is an important diagnostic tool. The region of solid-density plasmas can be probed by x-ray Thomson scattering. The scattering cross section is related to the dynamic structure factor S(k,ω). We improve the standard treatment of the scattering on free electrons within the random phase approximation (RPA) by including collisions [1]. S(k,ω) is calculated via the dielectric function at finite wavenumbers which can be obtained by using a generalized Mermin ansatz [2]. The dynamic collision frequency is treated in Born and Lenard-Balescu approximation [3]. We show that theoretical description beyond the RPA is crucial to obtain reliable results for the plasma parameters. Experimental investigation at experimental parameters where a treatment beyond RPA is required are under preparation for the VUV-FEL at DESY, Hamburg.
[1] A. Höll, R. Redmer, G. Röpke and H. Reinholz, Eur. Phys. J. D 29, 159-162 (2004)
[2] A. Selchow at al., Phys. Rev. E 64, 056410 (2001)
[3] H. Reinholz, R. Redmer, G. Röpke, A. Wierling, Phys. Rev. E 62, 5648 (2000)

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