Isotope dependence of the type I ELMy H-mode pedestal in JET-ILW hydrogen and deuterium plasmas

Abstract The pedestal structure, edge transport and linear MHD stability have been analyzed in a series of JET with the ITER-like wall hydrogen (H) deuterium (D) type I ELMy H-mode plasmas. pressure is typically higher D than H at same input power gas rate, difference mainly due to lower density (Maggi et al (JET Contributors) 2018 Plasma Phys. Control. Fusion 60 014045). A balance analysis has shown that inter-ELM separatrix loss required maintain similar top pressure. This qualitatively consistent set interpretative EDGE2D-EIRENE simulations for plasmas, showing particle heat coefficients are needed match experimental profiles. It also concluded neutral penetration between leads only minor changes upstream profiles trends opposite observations. implies role setting pedestals, but ELM and/or likely be main players. simulations, simultaneous outer divertor target profile constraints, indicated electron temperature pair discharges low fueling rate stored energy (which rate). isotope dependence found small, if considered D, this could lead destabilization peeling-ballooning modes shrinking boundary, reduced confinement H.