Abstract
The efficiency of the electron-cyclotron current drive using 60-GHz sources in the DIII-D tokamak is numerically investigated for the following cases: The inside-launched fundamental extraordinary mode, the outside-launched fundamental ordinary mode, and the outside-launched second-harmonic extraordinary mode. In the limit-weak ECH power and for plasma parameters relevant for experiments, illumination of the plasma with inside-launched fundamental extraordinary mode is found to have the highest efficiency. >
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