H mode power threshold and confinement in JET H, D, DT and T plasmas

The scaling of both the L-H threshold and confinement with the mass M of hydrogenic isotopes is discussed. The confinement was found to scale differently with M in the core and the edge, and a two region model has been developed to represent the physical behaviour of each region. Identity pulses with the same profiles of the dimensionless physics parameters r*, n* and b were obtained with different isotopes, H and D; this result suggests that there is no explicit mass dependence of the transport in either the core or the edge region.