Demonstration of ECCD Stabilization of m/n$=$\textbf{2/1 NTMs in the Equivalent Low-Torque ITER Baseline Scenario in DIII-D}

Experiments in DIII-D are studying how best to minimize the average Electron Cyclotron Current Drive power directed at q$=$2 for stabilization of neoclassical tearing modes in discharges with the ITER shape and equivalent low-torque, low q95\textasciitilde 3.1 and low betaN\textasciitilde 1.8. ITER relies on localized ECCD to stabilize NTMs that would otherwise wall-lock and lead to disruption. The work contrasts the control strategies of pre-emption by continuous ECCD at the rational surface (``Active Tracking'') vs. suppression by a pulse of ECCD whenever a growing mode is detected (``Catch {\&} Subdue''). The large rho\textasciitilde 0.75 for q$=$2 and concomitant low Te make the EC current drive relatively weak per MW so that the EC power from 4\textasciitilde 5 well-aligned gyrotrons of 2.5\textasciitilde 2.8 MW, is just marginal for stabilization at about 70{\%} of the neutral beam injection power. The low-torque makes early mode detection and good initial alignment imperative for prompt suppression before wall-locking. Requirements for stabilization will be presented.