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We employ a new gyrokinetic threshold model to predict a bifurcation intokamak pedestal width and height scalings that depends strongly on plasmashaping and aspect-ratio. This bifurcation arises from the first and secondstability properties of kinetic-ballooning-modes that yield wide and narrowpedestal branches, opening up the operating space of accessible pedestal widthsand heights. The wide branch offers potential for edge-localized-mode-freepedestals with a high core pressure. For negative triangularity,low-aspect-ratio configurations are predicted to give steeper pedestals thanconventional-aspect-ratio. Both wide and narrow branches have been attained intokamak experiments.

Kinetic-Ballooning-Bifurcation in Tokamak Pedestals Across Shaping and Aspect-Ratio