Laser - Target Interaction Of Temperature And Radiation Hydrodynamics Calculation

In this paper,radiation hydrodynamics model is used to study the interaction between short pulse intense laser and plane Au target,which includes laser's propagation and absorption in plasma,X-ray emission,plasma development and its thermodynamic state. The equations which are used in the radiation hydrodynamic model include the hydrodynamic equation of plasma,the absorption equation of laser,non-LTE electron occupation probability equations,electron ion and photon energy equations (three -temperature equations),and the state equation of matter and so on. Von Newman explicit scheme is used to solve hydrodynamic equations. Because of the strong stiff of the electron occupation probability equation,we adopt mutipletime-scale perturbation theory to transfer them into algebra equation and differential equation with low stiff. Three temperature equations include disconnected thermal conductivity coefficient and energy exchange terms between electron and ion,electron and photon,which are affected by the density and temperature of the plasma,and by the atom parameter. Implicit scheme have to be used to solve them. We use entirety linear iteration method to do this work. The opacity of element is calculated with a BSA(band smear approximation) theory on the basis of hydrogen-like screen average atom model.Laser interaction with target is simulated according to the model and methods given above,the state of laser plasma and X-ray transform coefficient are obtained. The effect of laser intensity and the wavelength on the state of laser plasma and X-ray transform coefficient is also presented. The results agree with the theoretical analysis and computational result given by other references. Our work provides a reference to further study of laser interaction with target.