New calculation method for target implosion including shock wave

The sound speed in the fuel is derived by using the Sesame Library. It is shown that accelerations by shock waves are inevitable for the fuel implosion, since the final implosion velosity of the fuel is larger than the sound velocity. In order to simulate the implosion motion of the fuel, one-dimensional hydrodynamic codes with artificial viscosities have been employed so far. The ion temperature and the fusion parameter at the most dense stage of the fuel strongly depend on the mesh width through the artificial viscosity. Instead of the artifisial viscosity which expresses the shock waves in the imploding fuel, a shock adoption method is proposed here to be used, which applies the Rankine-Hugoniot relations for the shock wave in the fuel. (author)