Constructing frequency dependent spectra sources for use in high energy density physics and inertial confinement fusion simulations

Many experiments in inertial confinement fusion/high energy density physics utilize indirect drive, where lasers shine into a hohlraum and the light is converted to x-rays. Laser packages in simulations provide the most complete physics for comparison to experiments, but are complex and time consuming to run, especially when the target (and not the hohlraum or laser pulse) is being changed in a design process. Simplified time dependent temperature profiles on a target are faster to simulate, but miss important physics associated with higher photon energies from the hohlraum. A middle ground is to run a frequency dependent spectral (FDS) source, but these are nearly always derived from previous simulations that include the laser package, which may not be practical to run. In this talk, we present a method for constructing an FDS source from a time dependent temperature history and ways to include non-Planckian terms such as hohlraum M-band and L-band emission from the high-Z wall. The constructed sources are used in simulations and compared to both extracted FDS sources and temperature histories. Release number LA-UR-21-26577. This work conducted under the auspices of the U.S. DOE by LANL under contract 89233218CNA000001.