Berlin 2001 – wissenschaftliches Programm

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P: Plasmaphysik

P 10: Theory and Plasma Diagnostic (Poster Session)

P 10.7: Poster

Mittwoch, 4. April 2001, 12:30–15:00, AT2

Inverse Bremsstrahlung in hot, dense plasmas — •Thomas Millat¹, August Wierling¹, Ronald Redmer¹, Heidi Reinholz², and Gerd Röpke¹ — ¹Universität Rostock, Fachbereich Physik — ²University of Western Australia, Department of Physics

We present a many-particle approach to the absorption coefficient for radiation in a plasma, starting from the relation of the absorption coefficient α(ω) and the refractive index n(ω) to the dielectric function. Within a generalized Linear-response theory, the dielectric function is expressed in terms of equilibrium correlation functions which allow for a perturbative treatment. We determine the dielectric function for fully ionized weakly coupled plasmas in the low-density limit. The total dynamical collision frequency is calculated within a generalized Gould-De Witt approach. Dynamical screening is taken into account by partial summation of loop diagrams, while strong collision effects are treated within a ladder approximation. Comparison is made with simulation studies.