Role of magnetic configuration and heating power in ITB formation in JET

An extensive database of more than 250 OS plasmas with different power level, heating scheme and current profile control has been formed and used to determine the conditions for ITB formation. The results of the database analysis are presented which confirm the crucial role of excess power and other key plasma parameters. JET experiments have also shown that the magnetic configuration, particularly the q-profile and magnetic shear, also play an important role in the ITB formation. Different scenarios, which have been used on JET to tailor the q-profile, will be discussed. Results of the predictive modelling of a series of JET OS plasmas are presented alongside experimental results. (author)