A slow wave antenna has been designed to propagate Alfvén waves unidirectionally in the Texas Tech Tokamak. The antenna receives 30‐kW rf pulses at 4–20 MHz, directly from a 50‐Ω transmission line, without matching circuitry. Unidirectional Alfvén waves are successfully excited in the tokamak over a wide range of frequencies. Power coupling is approximately 36% with a little higher coupling during excitation of a pronounced toroidal eigenmode.
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J. D. Kraus, Antennas (McGraw‐Hill, New York, 1950), Chap. 7.
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For wave identification, see P. D. Coleman, Ph.D. thesis, Texas Tech University, 1983.
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© 1985 American Institute of Physics.
1985
American Institute of Physics
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