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In a series of high performance diverted discharges on DIII-D, we demonstratethat strong negative triangularity (NT) shaping robustly suppresses alledge-localized mode (ELM) activity over a wide range of plasma conditions:$\langle n\rangle=0.1-1.5\times10^{20}$m$^{-3}$, $P_\mathrm{aux}=0-15$MW and$|B_\mathrm{t}|=1-2.2$T, corresponding to$P_\mathrm{loss}/P_\mathrm{LH08}\sim8$. The full dataset is consistent with thetheoretical prediction that magnetic shear in the NT edge inhibits access toELMing H-mode regimes; all experimental pressure profiles are found to be at orbelow the infinite-$n$ ballooning stability limit. Importantly, we also reportenhanced edge pressure gradients at strong NT that are significantly steeperthan in traditional ELM-free L-mode plasmas and provide significant promise forNT reactor integration.

Robust avoidance of edge-localized modes alongside gradient formation in the negative triangularity tokamak edge