Single-shell direct-drive capsule designs to study effects of perturbations on burn

The effect of small localized perturbations, such as fill tubes and mounting tents, on the NIF ignition capsule and the effect of hemi-joints on high gain double shell capsules are an important issue in achieving ignition on NIF. Our codes have difficulty modeling small features and their effect on mix. Because of issues of symmetry, shock timing, high-z shells, mix etc. trying to understand the effect of localized perturbations ("defect") on these high gain NIF capsules will be difficult. To begin the study of defects on DT burn, a direct-drive exploding pusher is used. Experimental results are presented for capsules with and without defects. The unperturbed capsules give reproducible yields while the perturbed capsules show significant drops in yield. Both AMR and Lasnex codes over predict the unperturbed capsule yield