Augsburg 2006 – wissenschaftliches Programm

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P: Plasmaphysik

P 28: Astrophysikalische Plasmen; Dichte Plasmen 1; Schwerionen- und lasererzeugte Plasmen 2; Staubige Plasmen 4; Theorie 1

P 28.6: Poster

Mittwoch, 29. März 2006, 17:30–19:00, Flure

Thermodynamics of dense Hydrogen-Helium plasmas – Path integral Monte Carlo calculations — •Vladimir Filinov^1,2, Pavel Levashov¹, Michael Bonitz², and Vladimir Fortov¹ — ¹Institute for High Energy Density, Russian Academy of Sciences, Izhorskaya 13/19, Moscow 125412, Russia — ²Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität zu Kiel, Leibnizstr. 15, 24098 Kiel

The thermodynamic properties of hydrogen, helium and hydrogen-helium mixtures are investigated by direct path integral Monte Carlo simulations [1]. The results are compared with available theoretical and experimental methods based, in particular, on the chemical picture. We investigate the effect of temperature ionization in low-density hydrogen plasma. We also present a number of calculated isotherms for hydrogen-helium mixtures with a mass concentration of helium Y=0.234 which is of relevance for giant planet interiors in the range from 100.000K to 2.000.000 K. In the density region where a sharp conductivity rise have been observed experimentally the simulations give indications for one or two plasma phase transitions. Further we compute the shock Hugoniot of deuterium and compare our results with recent experimental data.
[1] V.S. Filinov, P. Levashov, M. Bonitz, V.E. Fortov, Contrib. Plasma Phys. 45, 258-265 (2005) and Plasma Physics Reports 31, 700-704, (2005)