Bochum 2015 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 14: Poster Session - Theory and Modelling

P 14.12: Poster

Dienstag, 3. März 2015, 16:30–18:30, Foyer Audimax

Thermal parameters of Super-FRagment Separator target materials — •Claudia-Veronika Meister, Dieter H.H. Hoffmann, and Bowen Jiang — Technische Universität Darmstadt, Institut für Kernphysik

In the targets and beam catchers of the future Super-FRagment Separator (S-FRS) of the Facility for Antiproton and Ion Research FAIR at GSI, stress waves will be generated by intense, fast ion beams, which deposit a high amount of energy within a very short time interval. This may cause a thermo-mechanical damage of the material. In this connection, a comprehensive theoretical study of thermal parameters, such as heat capacity, coefficient of thermal expansion, as well as the thermal transport coefficients in the warm dense matter is necessary.

In the present work, the thermal parameters are being estimated based on a virial expansion of the equation of state of nonideal plasmas up to the density order 2 at least. The thermal conductivity is being found using the linear response theory. In doing so, the Zubarev-formalism is applied, as it takes also non-mechanical perturbations, e.g. the heat current, into account. Within the frame of the Zubarev formalism, the transport coefficients are expressed by force-force correlation functions depending on structure factors of the target material. The structure factors are being calculated using the mean spherical approximation. Within the present work, some results are obtained for alkali and aluminum targets, especially at the melting point.