Measurements of 3D hydrodynamic instabilities at ablation front in indirect-drive ICF implosions on NIF

Hydrodynamic instabilities are major factor in degradation of spherical implosions in inertial confinement fusion (ICF). Instabilities at ablation front are some key contributors to overall stability of x-ray driven implosions. We present results of hydrodynamic instability experiments with high-density-carbon (HDC) ablators on National Ignition Facility (NIF). The unstable growth of 3D perturbations was measured with x-ray radiography using Hydrodynamic Growth Radiography (HGR) platform and crystal backlighter imager (CBI). The dependence of the instability growth on initial perturbations at outer capsule surface will be presented.