It presents some numerical methods to simulate the complicated behavior of the plasma flow in laser hohlraum target, Which include adaptive technique of the meshes and moving grid method, etc. The calculated results show that these methods are effective.

The energy exchanging term between electron and radiation often makes the three temperature energy equations stiff at T_e~T_r region and causes difficulty in numerical simulation of laser-target coupling.In near local thermodynamic-equilibrium (LTE) region,the emission and absorption of radiation are large and nearly equal,which results in divergence of iteration.In order to solve this problem,this paper discusses a method in which different expressions of the energy exchanging term in non-LTE and nearly LTE regions are given.The energy exchange in near LTE case has been calculated by using Rossland mean free path,instead of bound electron population.

Main processes involved in the laser-target coupling are described,including the absorption of laser light,heat conduction of electron,plasma motion,nonequilibrium ionization,laser X-ray conversion and the radiation transport.It outlines the numerical simulation,presenting the partial differential equations,constructing the finite difference schemes and describing the solving methods.Finally,some calculated results are given.

A two-dimensional relativistic electromagnetic particle simulation code (2DCIC) is presented. The charge and current densities are computed self-consistently using Maxwell's equations, relativistic motion equations of electrons and Newton's equations of ions by tracking 10⁴-10⁶ simulated particles. some details of wave wave and wave particle interaction are also studied together with the evolution of instability as time. Laser light impinges obliquely (or normally) on plasma, which has a density gradient (or homogeneous density). To save computational time, the parallel computational method is developed. Using this code, the ultrashort intense pulse laser plasma interaction and other plasma problems can be also studied by modifying parameters of physical model. After a lot of test computation, plasma equilibrium and propagation of ultrashort intense pulse laser in plasma are studied. The computed physical picture is reasonable.

The physical processes of radiative ablation and burn-through of Al foil are theoretically studied using the time-dependent radiation temperature curve inside the cylindrical hohlraum measured on Shenguang-Ⅰ facility.Some scaling laws and numerical simulation results are simultaneously presented.

The paper presents the main processes of physics and the outline of the computational program related laser X-ray conversion, gives the typical pictures and numerical results. Based on numerical simulations, the laws of some important properies of physics are obtained, the results estimated by the scaling lasw are in comparison with the measurement values, they are coincident each other on quantitative tendency and quantitative results.