| The physical properties of hydrogen and helium at high pressures are the most ele-mentary content in the inertial confinement fusion(ICF). They play an important part indesign of the fuel target, inhibition of hydrodynamic instability and understanding of theignition process. At present, the physical properties within P < 100GPa can be studiedusing the gas gun experimentally or the free energy theory model. However, there are nodata of the physical properties within 102 < P < 106GPa because of the complexity ofthe degeneracy and the coupling of the low-Z plasma systems. On the other hand, it isnecessary to study the low-Z materials using laser experimentally. So the studies of thephysical properties at high pressures by the first-principles molecular dynamics and theKrF laser are the purpose of this work. The main results are summarized as follows:1. The scope of application of the first-principles molecular dynamics(FPMD) sim-ulations are extended to high density areas and the most of thermodynamic properties byimproving the algorithm and programming.2. The properties of the hydrogen, helium and helium-hydrogen mixture are studied.The results obtained are close to the results of the chemical free energy model at lowpressures and close to the results of the Thomas-Fermi model at extremely high pressures.The studied properties include equations of state, melting curve and transport coe?cient.3. The EOS of deuterium-titanium has been studied using the long pulse KrF laser.The EOS of hydrogen and helium within 102 < P < 106GPa have been obtained us-ing FPMD. The temperature could decrease the pressures of metallization and the densitymade the dissociation temperature smaller. The relationships among the melting curve,the dissociation curve and metallization curve are discussed for the first time. We foundthat the linear mixed mode were not right at high pressures for helium-hydrogen mixture.The EOS of deuterium-titanium has been studied.
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