1.0-MJ CH-Foam Ignition Targets on the NIF Using 1-D Multi-FM SSD with 0.5 THz of Bandwidth

The 1-D multiple-frequency-modulator (Multi-FM) smoothing by spectral dispersion (SSD) system smoothes low $\ell $-mode ($\ell <$ 100) illumination nonuniformities by taking advantage of multiple color cycles dispersed across the laser beam cross section. Multi-FM systems do not produce unsmoothed resonant features in the higher $\ell $ modes as found in single-modulator systems. The 1-D Multi-FM SSD system is being investigated to provide adequate smoothing with a bandwidth of only 0.5 THz so that dual-frequency-conversion crystals are not required. Cryogenic, 1.0-MJ CH-foam ignition designs are being studied using 1-D Multi-FM SSD and the performance will be compared to the full 2-D SSD, 1.0-THz system using the 2-D radiation-hydrodynamics code \textit{DRACO}. Such \textit{DRACO} simulations incorporate the coherence-time model supported by far-field simulations. This work was supported by the U.S. Department of Energy Office of Inertial Confinement Fusion under Cooperative Agreement No. DE-FC52-08NA28302.