Title :
Thermodynamic properties and plasma phase transition in dense hydrogen mixtures
Author :
Filinov, V.S. ; Bonitz, M. ; Fortov, Vladimir E. ; Levashov, P.R.
Author_Institution :
Inst. for High Energy Densities, Acad. of Sci., Moscow, Russia
Abstract :
Summary form only given. The internal energy and equation of state of dense hydrogen and hydrogen-helium mixture are investigated by direct path integral Monte Carlo method which are further improved in comparison to our previous results. Data for four isotherms T=10,000 K, 30,000 K, 50,000 K and 100,000 K are presented. For T=10,000 K it is shown that the internal energy is lowered due to droplet formation for densities of the order 10/sup -23/ cm giving direct support for the existence of a plasma phase transition in megabar hydrogen. The thermodynamic properties of warm dense matter, such a hydrogen and hydrogen mixture at megabar pressure, are essential for the description of plasmas generated by strong lasers, ion beams or free electron lasers. Among the phenomena of particular current interest are the high-pressure compressibility of deuterium, metalization of hydrogen, Wigner crystallization plasma phase transition etc., which occur in situations where both interaction and quantum effects are relevant and a crossover from a neutral system to full ionization takes place. We use the direct fermionic path integral Monte Carlo simulations to investigate the dense plasmas in a wide range of densities and temperatures.
Keywords :
Monte Carlo methods; compressibility; deuterium; drops; free electron lasers; helium; high-pressure effects; hydrogen; plasma density; plasma simulation; plasma temperature; plasma thermodynamics; 10000 K; 30000 K; 50000 K; D; H/sub 2/; He; Wigner crystallization; dense hydrogen; dense hydrogen mixture; dense plasmas; deuterium compressibility; direct fermionic path integral Monte Carlo simulations; direct path integral Monte Carlo method; droplet formation; equation of state; free electron lasers; hydrogen metalization; hydrogen-helium mixture; internal energy; ion beam; isotherms; neutral system; plasma density; plasma phase transition; plasma temperature; quantum effects; strong lasers; thermodynamic properties; warm dense matter; Free electron lasers; Hydrogen; Integral equations; Ion beams; Laser transitions; Plasma density; Plasma properties; Plasma simulation; Plasma temperature; Thermodynamics;
Conference_Titel :
Plasma Science, 2004. ICOPS 2004. IEEE Conference Record - Abstracts. The 31st IEEE International Conference on
Conference_Location :
Baltimore, MD, USA
Print_ISBN :
0-7803-8334-6
DOI :
10.1109/PLASMA.2004.1340068