Frustraum 1100 campaign on the National Ignition Facility

The frustraum 1100 campaign aims to reduce the hohlraum losses by approximately 15% relative to previous cylindrical implosions in order to couple more energy into the capsule while still providing symmetry control.¹ These reduced hohlraum losses translate effectively into an equivalent increase in laser energy, ~300 kJ, which can then be used to drive hydroscaled implosions with greater robustness, reduced coast times or thicker ice layers to increase burn efficiency. We will present the results from an initial set of experiments conducted in a frustraum² hohlraum. These experiments implemented an energy walkup using a VISAR platform to measure shock strength and symmetry and radiography and self-emission platforms to measure inflight and stagnated shape. The experiments looked at azimuthal smoothing of outer beam intensity to reduce gold bubble motion and provided an initial look at P2 symmetry control in the platform by applying a wavelength offset between cones of beams to control the level of cross-beam energy transfer between the cones.