For the upper electron cyclotron wave launcher on the international thermonuclear experimental reactor (ITER), the use of a 'remote steering antenna' based on the imaging properties of square waveguides is planned. To characterize launchers of this type, low-power experiments on a four-side corrugated square waveguide, with a scanning mirror at the input of the waveguide, were performed in the frequency range 140–160 GHz.It is shown that elliptical polarization, which is necessary for the electron cyclotron current drive (ECCD), can be transmitted without depolarization and that the usable steering range of the antenna is at least 20°.Low-power measurements demonstrate that mitre bends can be integrated into the waveguide, practically without extra loss. Detailed calorimetric measurements for this set-up confirm this statement for the polarization perpendicular to the scanning plane, whereas excess loss is measured for the parallel polarization. Various modifications of mitre bends are investigated and results are discussed.

Performance of a remote steering antenna for ECRH/ECCD applications

Institute for Plasma Research, University of Stuttgart, D-70569 Stuttgart, Germany, e-mail: kasparek@ipf.uni-stuttgart.de Karlsruhe Research Center, Association EURATOM-FZK, Institute for Pulsed Power and Microwave Technology, D-76021 Karlsruhe, Germany Max-Planck-Institute for Plasma Physics, Ass. EURATOM-IPP, D-17491 Greifswald, Germany Max-Planck-Institute f. Plasma Physics, Ass. EURATOM-IPP, D-85748 Garching, Germany

High-power millimetrewave transmission systems and components for electron cyclotron heating of fusion plasmas

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High-power millimetrewave transmission systems and components for electron cyclotron heating of fusion plasmas