Plasma confinement in JET H?mode plasmas with H, D, DT and T isotopes

The scaling of the energy confinement in H?mode plasmas with different hydrogenic isotopes (hydrogen, deuterium, DT and tritium) is investigated in JET. For ELM-free H?modes the thermal energy confinement time ?th is found to decrease weakly with the isotope mass (?th ~M-0.25?0.22), whilst in ELMy H?modes the energy confinement time shows practically no mass dependence (?th ~M0.03?0.1). Detailed local transport analysis of the ELMy H?mode plasmas reveals that the confinement in the edge region increases strongly with the isotope mass, whereas the confinement in the core region decreases with mass (?thcore M-0.16), in approximate agreement with theoretical models of the gyro-Bohm type (?gB ~M-0.2).