Abstract
An analysis of the effect of magnetic geometry on heat flux in a wide range of single null diverted discharge configurations with 1.5<κ95<2.2, 0.2<δ95<0.45 suggests that elongation is beneficial for confinement. If heat diffusivities are assumed not to depend on plasma shape, the predicted exponent for a power law scaling with elongation is ακ≈0.74, based on the configurations in the study. This is very close to dependences from the ITER database for discharge conditions, such as ELMy H-modes, obtained from a large number of experiments in various tokamak devices.