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.