MCNP® calculations for inner-shell radiography of double-shell implosions on the NIF

The National Ignition Facility (NIF) Double Shell Team is planning radiography experiments using the Advanced Radiographic Capability (NIF-ARC) to measure the properties of the imploding inner Cr shell. These include the shape, the energy transfer from the outer to inner shell, the density profile, etc. The NIF-ARC produces a broad-band x-ray source with energies from ~10 keV to a few hundred keV. The Monte Carlo N-Particle® (MCNP®) code was used, in photon mode, to simulate the radiography, with a particular focus on understanding the transmission and scattering. The ultimate goal is to develop a technique to reconstruct the density profile of the compressed inner shell from the radiograph.