Characteristics of various confinement regimes obtained with EC and LH heating on the TdeV tokamak

Steady-state H-modes in type III ELM regime on TdeV with electron cyclotron and lower hybrid heating are investigated with respect to lower hybrid wave coupling, threshold power, helium pumping and separation between separatrix and surrounding structures. Energy confinement is found to improve as the distance between separatrix and divertor baffle is reduced. With off-axis EC heating, reduced particle transport is observed inside the deposition zone, but no energy transport barrier is obtained. New measurements on compact toroid fuelling are reported which indicate that further optimization of the injector is required. (author)