Characterization of Operational Phase Space and Pedestal Structure of Quiescent and ELMing H-modes in DIII-D and Comparison to EPED

Enhanced confinement regimes, such as the standard Quiescent H (QH)-mode and Wide Pedestal Quiescent H (WPQH)-mode that have been demonstrated on DIII-D, may address key challenges for extrapolating transients to future devices. A database of ELMing, standard QH, and WPQH discharges, with over 130 time slices, has been assembled to quantify how effectively current pedestal models, such as EPED, can characterize non-ELMing regimes and the regions in parameter space that demonstrate the largest deviations from predictions. We fit profiles to obtain quantitative results that inform our understanding of fundamental transport physics. Derived quantities include gradient scale-lengths L and Hahm-Burrell shearing rates, which provide context for what types of turbulence might be observed in turbulence limited pedestals. Dimensionless quantities, such as collisionality and normalized beta in the pedestal, are used to characterize regime operational spaces. Each regime exhibits distinct profile features, including, (1) ELMing discharges typically have larger collisionalities at the separatrix, (2) WPQH discharges have lower η_e = L_n/L_T across the pedestal, and (3) standard QH discharges have higher peak Hahm-Burrell shear. These results are consistent with and extend previous observations, and they are quantified through the statistics of the database.