Optimizing Stability, Transport, and Divertor Operation Through Plasma Shaping for Steady-State Scenario Development in DIII-D

摘要

Recent studies on DIII-D have elucidated key aspects of the dependence of stability, confinement, and density control on the plasma magnetic configuration, leading to the demonstration of nearly non-inductive (i.e., total inductive current (approx.)0) operation for >1 s with pressure 30% above the ideal no-wall stability limit. Achieving fully noninductive operation requires high pressure, good confinement, and density control through divertor pumping. Plasma geometry affects all of these. Ideal MHD modeling of external kink stability suggests it may be optimized by adjusting the shape parameter known as squareness. Optimizing kink stability means increasing the maximum stable pressure.