Abstract
The design of antenna arrays for fast wave current drive (FWCD) involves several issues and trade-offs in addition to the usual considerations in the design of fast wave antennas for plasma heating. One feature of a well-designed FWCD antenna is that it will function efficiently for plasma heating when phased symmetrically. Most of the antennas in use today on major fusion experiments were designed solely for heating and are generally not suitable for current drive. New RF systems capable of addressing FWCD are being installed on a number of machines, including DIII-D and the Joint European Torus (JET).
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