Real time avoidance of the density limit via proximity control of an empirical edge density boundary
2024 Research Campaign, Thrust: High Opacity and Density Operation
Purpose of Experiment
The mission of this experiment is to evaluate a potential path to exceeding the Greenwald limit by leveraging two recent advances at DIII-D: a proximity-to-density-limit metric and the “Proximity Control” algorithm. The experiment will first reproduce a L-mode density limit (LDL) disruption, either from 191793 or an LDL developed during MP 2024-36-01. Then, it will apply real-time feedback control to enable stable operation at high density. The main objective is to avoid a density limit disruption, and the “reach” goal is to exceed the Greenwald limit in a stable discharge via pellet fueling and feedback control on auxiliary heating.