Abstract
Lower hybrid current drive (LHCD) is applied to improve the confinement in the WT-3 tokamak. With increasing the lower hybrid (LH) power, a sharp decrease in electron thermal diffusivity χ e is observed at a certain LF power. The χ e is directly measured by applying the simple time-to-peak method to propagation of a heat pulse induced by a short electron cyclotron heating (ECH) pulse. A high electron temperature is obtained by applying ECH to the LHCD plasma with improved χ e. The efficiency of ECH in the LHCD plasma with improved χ e becomes three times that in ohmic heating plasmas.
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