The ion heat transport in the pedestal of H-mode plasmas is investigated in various H-mode
discharges with different pedestal ion collisionalities. Interpretive modelling suggests that in
all analyzed discharges the ion heat diffusivity coefficient,
χ
i
, in the pedestal is close to the
neoclassical prediction within the experimental uncertainties. The impact of changing the
deposition location of the electron cyclotron resonance heating on the ion heat transport has
been studied. The effect on the background profiles is small. The pre-ELM (edge localized
modes) edge profiles as well as the behaviour of the electron temperature and density, ion
temperature and impurity toroidal rotation during the ELM cycle are very similar in discharges
with on- and off-axis ECRH heating. No significant deviation of
χ
i
from neoclassics is
observed when changing the ECRH deposition location to the plasma edge.European Commission (EUROfusion 633053)European Union (EUROfusion Grant WP14-FRF-IPP
