Horvath, L.Maggi, C. F.Chankin, A.Saarelma, S.Field, A. R.Aleiferis, S.Belonohy, E.Boboc, A.Corrigan, G.Delabie, E. G.Flanagan, J.Frassinetti, L.Giroud, C.Harting, D.Keeling, D.King, D.Maslov, M.Matthews, G. F.Menmuir, S.Silburn, S. A.Simpson, J.Sips, A. C. C.Weisen, H.Gibson, K. J.2021-04-102021-04-102021-04-102021-04-0110.1088/1741-4326/abdd77https://infoscience.epfl.ch/handle/20.500.14299/177205WOS:000629143800001The pedestal structure, edge transport and linear MHD stability have been analyzed in a series of JET with the ITER-like wall hydrogen (H) and deuterium (D) type I ELMy H-mode plasmas. The pedestal pressure is typically higher in D than in H at the same input power and gas rate, with the difference mainly due to lower density in H than in D (Maggi et al (JET Contributors) 2018 Plasma Phys. Control. Fusion 60 014045). A power balance analysis of the pedestal has shown that higher inter-ELM separatrix loss power is required in H than in D to maintain a similar pedestal top pressure. This is qualitatively consistent with a set of interpretative EDGE2D-EIRENE simulations for H and D plasmas, showing that higher edge particle and heat transport coefficients are needed in H than in D to match the experimental profiles. It has also been concluded that the difference in neutral penetration between H and D leads only to minor changes in the upstream density profiles and with trends opposite to experimental observations. This implies that neutral penetration has a minor role in setting the difference between H and D pedestals, but higher ELM and/or inter-ELM transport are likely to be the main players. The interpretative EDGE2D-EIRENE simulations, with simultaneous upstream and outer divertor target profile constraints, have indicated higher separatrix electron temperature in H than in D for a pair of discharges at low fueling gas rate and similar stored energy (which required higher input power in H than in D at the same gas rate). The isotope dependence of linear MHD pedestal stability has been found to be small, but if a higher separatrix temperature is considered in H than in D, this could lead to destabilization of peeling-ballooning modes and shrinking of the stability boundary, qualitatively consistent with the reduced pedestal confinement in H.Physics, Fluids & PlasmasPhysicstokamakisotope effecth-modepedestalconfinementjet-ilwtext::journal::journal article::research article