Radiation trapping efficiency in Double Liner and Dynamic Hohlraum

Summary form only given. In the concepts of the Double Liner and Dynamic Hohlraum a high intensity thermal X-radiation is generated by colliding of an outer cylindrical plasma shell (liner) onto an inner liner. The outer liner plasma driven by pulsed power current strikes the inner shell with velocity of 500 km/s and produces a strongly radiating shock wave in the inner liner plasma. The radiation is partially trapped by the outer liner and due to that a radiation intensity inside a liners may be much more than outside. That trapped radiation is used to irradiate a target for High Energy Density Physics or inertial Confinement Fusion research. The radiating shock wave is generated in a substance of the inner liner by pressure of the magnetic field partially frozen into plasma of the outer shell and compressed together with plasma during strike. The outer shell decelerates without shock wave due to a high elasticity of the magnetic field. The inner shell substance is composed of light and heavy atoms in certain proportion to be optically thin to provide a radiation penetration to a target and to produce effectively X-radiation in lines at the same time. The high intensity thermal radiation is produced in the shock wave as a result of a chain of processes i.e. light ion component viscose heating, electron heating in ion-electron elastic collisions and excitations of doped multicharged (Z/spl Gt/1) ions by electrons. The line X-radiation is absorbed mainly by the same kind of atoms and thermalized due to overlapping of line wings of different ions in the outer shell plasma. Spectral mixture of high-Z elements having the maximal Rosseland mean absorption coefficient for typical conditions makes the outer shell optically thick during liner-liner collision process and confines the radiation energy inside. An efficiency of a radiation thermalization and thermal X-radiation albedo augmentation by the mixed heavy ion plasma of the outer shell taking into account non-LTE eff- cts onto the ion composition and temperature gradient are considered to increase the radiation intensity inside the Double Liner (Dynamic Hohlraum) cavity.