MPI für Plasmaphysik / Conference Papers |
|Performance of a remote steering antenna for ECRH/ECCD applications using 4-Wall corrugated square wave-guide|
|Authors:||Kasparek, W.; Gantenbein, G.; Plaum, B.; Wacker, R.; Filipovic, E.; Chirkov, A. V.; Denisov, G. G.; Kuzikov, S. V.; Ohkubo, K.; Hollmann, F.; Wagner, D.|
|Publisher:||World Scientific Publ.|
|Place of Publication:||New Jersey, NJ|
|Date of Publication (YYYY-MM-DD):||2003|
|Title of Proceedings:||Proceedings of the 12th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Heating|
|Name of Conference/Meeting:||Electron Cyclotron Emission and Electron Cyclotron Heating (EC-12)|
|Place of Conference/Meeting:||Aix-en-Provence (FR)|
|(Start) Date of Conference/Meeting|
|End Date of Conference/Meeting |
|Copyright:||Copyright 2003 World Scientific Publ.|
|Review Status:||Internal review|
|Abstract / Description:||For the upper ECW launcher on ITER, the use of a “remote steering antenna” based on the imaging
properties of rectangular waveguides is planned. To characterise launchers of this type, low-power
experiments on a 4-side corrugated square waveguide with a scanning mirror at the input of the
waveguide were performed in the frequency range of 140 to 160 GHz.
It is shown, that elliptical polarisation needed for ECCD can be transmitted without depolarisation.
The usable steering range of the antenna is at least –10° < j £ +10°. Experiments with the scanning
plane in the diagonal of the square waveguide led to a negligible increase the scanning range, and
lobes in the upward and downward direction are detected at larger scanning angles.
Mitre bends can be integrated into the waveguide without prohibitive extra loss, which is
demonstrated by far-field measurements. Detailed calorimetric measurements for this set up confirm
this statement for the polarisation perpendicular to the scanning plane, whereas extra loss is measured
for the parallel polarisation. Results are discussed and are compared to theory.
|External Publication Status:||published|
|Communicated by:||N. N.|
|Affiliations:||MPI für Plasmaphysik/Tokamak Edge and Divertor Physics (E2)|
|External Affiliations:||Institut für Plasmaforschung, Pfaffenwaldring 31, D-70569 Stuttgart, Germany; Institute of Applied Physics, Russian Academy of Sciences, 603600 Nizhny Novgorod, Russia; National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, 509-5292, Japan|
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