Energy deposition and first wall response in the SIRIUS-T target chamber

The response of the first wall of the SIRIUS-T inertial confinement fusion (ICF) target chamber to high-gain target explosions has been investigated numerically. Calculations were performed for 100-MJ target explosions in target chambers filled with a 1-torr Xe background gas and lined with a graphite-tile first wall. X-ray and debris ion spectra consistent with single-shell direct-drive targets were used. A 1-D radiation-hydrodynamics code was used to study the target energy deposition in the cavity gas and the graphite tiles, the growth of and radiative emission from the microfireball, expansion of the shock front, and vaporization of and thermal conduction through the first wall. The results indicate that the inner radius of the target chamber must be at least 3.7 m to prevent premature degradation of the tiles due to vaporization