Vacuum Hohlraum energetic experiments on the National Ignition Facility*

Results from vacuum hohlraum energetics experiments on the National Ignition Facility using a subset of NIF's 192 beams are presented. In these experiments, the scaling of radiation temperature for conventional gold hohlraums as well as gold hohlraums lined with a thin gold-boron liner was measured. These experiments are the first test of hohlraum drive scaling at $\sim $ 70{\%} of full-NIF scale. We show how these results compare with scalings~developed on predecessor facilities at a fraction of the laser energy being used here. In NIF ignition hohlraums, one of the mitigation strategies for SBS is to mix boron into the inner 0.6 $\mu$m of the Au hohlraum wall. These experiments also test if, as predicted by simulations, there is no anomalous degradation of the radiation temperature due to the gold-boron liner.