Acknowledgement — The authors would like to thank Dr. N. Nagashima, Japan Atomic Energy Research Institute for his helpful suggestions. Thanks are also due to K. Sakurai and H. Inoue for their assistance with experiments. REFERENCES 1. H. Tanabe and N. Goto, A Ridged Waveguide Aperture Antenna, Paper of Technical Group, AP-80-22, Institute of Electronics and Communication Engineers of Japan, June 1980. 2. F.W. Perkins, ICRF Couplers. IAEA Technical Committee Meeting on Radio Frequency Heating in Large Fusion Experiments, Princeton Univ. PPL, 19-22, October 1981. 3. Y. Yano, N. Goto, and T. Nagashima, An ICRF Ridged Waveguide Coupler, IAEA Technical Committee Meeting on Radio Frequency Heating in Large Fusion Experiments, Princeton Univ. PPL, 19-22, October 1981.
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