Profile control by Local ECRH in LHD

The specific and the important feature of electron cyclotron resonance heating (ECRH) in magnetic fusion experiments is the well defined deposition profile and its controllability. This feature is realized and utilized for the electron temperature profile control, investigating the transport properties and current profile control in LHD. Temporally and spatially high resolution diagnostics, motional Stark effect (MSE), heavy ion beam probe (HIBP) as well as Thomson scattering, electron cyclotron emission (ECE) are applied to such locally heated or current driven plasma in LHD. The relations between the ECRH induced flux or current and the formation of the potential and density or induced current profile structure are clearly shown experimentally for the first time. (author)