Measurements of radiation heat transport in germanium: Validationinebreak of an opacity model

Abstract

Measurements of radiation heat transport in germanium foils have been made to validate calculations of the radiative opacity of the heated material. Thin germanium foils were indirectly heated to a temperature of 150 eV using thermal x radiation from a laser-produced gold plasma. Emission from the rear surface of the foils was recorded using a streaked soft-x-ray imaging diagnostic, and the measured radiation-burnthrough times were compared with hydrodynamic code simulations using tabular opacities from the imp code [S. J. Rose, J. Phys. B 25, 1667 (1992)]. The imp opacities are validated to better than \ifmmode\pm\else\textpm\fi{}50% accuracy.