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.