High confinement improvement (H-factor) relative to the IPB98(y,2) scaling law, stability and bN are achieved in JET hybrid scenario pulses due to formation of specific safety factor (q) profiles with broad flat region around q~1 in the plasma core and steep dq/dr at the edge. The replacement of the C-wall with Be/W-wall caused changes in the impurity content with effect on the q-profile, MHD, radiation and tE. An interaction between these factors in hybrid pulses with ILW has been analysed using transport modelling and important statistical tendencies identified.

Preprint of Paper to be submitted for publication in Proceedings of the 40th EPS Conference on Plasma Physics, Espoo, Finland 1st July 2013 - 5th July 2013