  Strongly-shaped diverted negative triangularity (NT) plasmas in the DIII-D
tokamak demonstrate simultaneous access to high normalized current, pressure,
density, and confinement. NT plasmas are shown to exist across an expansive
parameter space compatible with high fusion power production, revealing
surprisingly good core stability properties that compare favorably to
conventional positive triangularity plasmas in DIII-D. Non-dimensionalizing the
operating space, edge safety factors below 3, normalized betas above 3,
Greenwald density fractions above 1, and high-confinement mode (H-mode)
confinement qualities above 1 are simultaneously observed, all with a robustly
stable edge free from deleterious edge-localized mode instabilities. Scaling of
the confinement time with engineering parameters reveals at least a linear
dependence on plasma current although with significant power degradation, both
in excess of expected H-mode scalings. These results increase confidence that
NT plasmas are a viable approach to realize fusion power and open directions
for future detailed study.
