Effect of M-band on ablation front stability 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 pre-imposed modulations at various mode numbers was measured with x-ray radiography using Hydrodynamic Growth Radiography (HGR) platform. The experiments were conducted with Au and U hohlraums with \textasciitilde 25{\%} difference in M-band emission of x-ray drives. The dependence of the instability growth on M-band fraction will be presented.