Abstract
Current drive by applying lower hybrid wave is numerically investigated by using a one dimensional tokamak transport code in order to study effect of changes in plasma profiles on the efficiency of current drive. The efficiency is compared among small, medium, and large tokamaks. It is found that the deposition of wave power moves outwardly due to the increase in the local electron temperature. The efficiency depends on the scale of tokamak. For particularly large tokamak, the average efficiency increases with the width of resonance region in the velocity space of electrons, and reaches up to 1 MA/10 MW.
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