Abstract
Formation of electron transport barrier and achievement of central electron temperature of more than 10 keV are confirmed by electron cyclotron heating (ECH) in LHD. These are the result of highly concentration of the deposited power. The system are described which enables these experiments and clarifying the mechanisms of the formation of electron transport barrier. The formation of the transport barrier in LHD is limited in rather low density of below 5 × 1018 m−3 so far. The efforts and their results of further optimization of ECH system for the better understanding and for the formation in wider plasma parameters of the transport barrier are also discussed.
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