Beam Waveguide Reflector with Integrated Direction-Finding Antenna for In-Situ Alignment |
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Authors: | W Kasparek H Idei S Kubo and T Notake |
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Institution: | (1) National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, 509-5292, Japan;(2) Institut fuer Plasmaforschung, Universitaet Stuttgart, Pfaffenwaldring 31, D-70569 Stuttgart, Germany |
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Abstract: | An in-situ alignment system for beam waveguides based on an interferometric direction-finding antenna was investigated numerically and experimentally. The system consists of a reflector with four off-central positioned waveguide couplers in two directions. By nulling the difference of the power signals as well as the mixing signal from each coupler pair, spatial and angular alignments of a beam impinging on the mirror can be performed.In this paper, the characteristics of such a mirror are presented, and the design of a prototype intended for use in an ECH transmission line at LHD is described. Low-power as well as high-power tests at a frequency of 82.7 GHz were carried out, and the results are discussed. The device shows a high performance in agreement with theory. |
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Keywords: | Beam waveguide reflectors directional couplers alignment direction-finding gyrotron |
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