Symergy Designs for 96 Beam Full-pulse Pre-Ignition Hohlraums

A major thrust in the development of 192 beam, 4 cone-angle hohlraums for NIF is the measurement, prediction, and tuning of drive symmetry with 96 beam, 2 cone-angle hohlraums within the next year, as well as the diagnosis of laser plasma interaction (LPI) conditions. Hohlraum designs to emulate relevant LPI behavior are currently available\footnote{ NB Meezan (private communication)} and are being extended for scaled versions of 270 to 300 eV radiation temperature drives. We will present simulations with variable cone pointing and beam phasing for symmetry capsules in these configurations. The experiments we are designing will be crucial for demonstrating that we can measure, predict, and tune hohlraum drive symmetry in the presence of LPI under expected NIF conditions. The results should be useful for correlating the symmetry and timing of capsule implosions with laser beam propagation in the two cones.