Isotope Effect on H-mode Pedestal Characteristics in DIII-D Hydrogen and Deuterium Discharges

H-mode pedestal characteristics in `ITER baseline' deuterium discharges on DIII-D with D neutral beam heating were compared to H discharges with H neutral beams. The discharges had ITER cross-sectional shape and aspect ratio, q$_{\mathrm{95}}=$3.2, and $\beta_{\mathrm{N}}=$1.8. The electron density at the top of the H-mode pedestal, n$_{\mathrm{e}}^{\mathrm{PED}}$, was matched using main chamber gas puff fueling. The H cases required more gas and more heating power to match n$_{\mathrm{e}}^{\mathrm{PED}}$, and $\beta_{\mathrm{N}}$, giving ELM frequencies 4 to 8 times higher, contributing to lower carbon impurity concentration, 6n$_{\mathrm{C}}$/n$_{\mathrm{e}}=$0.1-0.25 compared to 0.6 for D. T$_{\mathrm{i}}$/T$_{\mathrm{e}}=$1for both H and D. The H discharges had outwardly shifted n$_{\mathrm{e}}$ profiles and narrower T$_{\mathrm{e}}$ pedestals giving lower T$_{\mathrm{e}}^{\mathrm{PED}}$, and T$_{\mathrm{i}}$. The total pedestal pressure varied in H discharges with the ELM frequency but was generally lower than in D. At the lowest H ELM frequency H and D pressures were comparable partially due to the lower impurity dilution. Both H and D discharges had pressure gradients consistent with peeling-ballooning stability, and had widths consistent with the EPED width scaling, although the higher ELM frequency H discharges had pedestal pressures significantly below the EPED prediction. Results from recent experiments covering a wider range of conditions in H and D will be presented.