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Plaum B.,University of Stuttgart | Lechte C.,University of Stuttgart | Kasparek W.,University of Stuttgart | Gaiser S.,University of Stuttgart | And 6 more authors.
Fusion Engineering and Design | Year: 2015

For the ECRH heating system of the stellarator Wendelstein 7-X, two remote steering antennas are developed and manufactured. The principle of remote steering antennas is based on the imaging characteristics of corrugated rectangular waveguides, which is well understood and can accurately be simulated. Several details, however, require deeper investigation. The antenna needs a miter-bend and a 24 mm gap. The positions of these elements need to be chosen carefully to reduce losses and stray radiation. The antennas are manufactured from copper by electroforming. This allows to integrate all components, including the corrugated inner walls and the cooling channels, in one vacuum-tight piece. This paper reviews the design process of the remote steering antennas for W7-X as well as technological issues and experimental results from test pieces. © 2015 Elsevier B.V. All rights reserved. Source


Lechte C.,University of Stuttgart | Plaum B.,University of Stuttgart | Kasparek W.,University of Stuttgart | Zeitler A.,University of Stuttgart | And 6 more authors.
International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz | Year: 2013

For electron cyclotron resonance heating of the stellarator W7-X at IPP Greifswald, a 140 GHz/10 MW cw millimeter wave system is in construction. Two out of 12 launchers will employ a remote-steering design. This paper describes design issues like input coupling structures, manufacturing of corrugated waveguides, optimization of the steering range, integration of vacuum windows, mitrebends and vacuum valves into the launchers, as well as tests of prototype parts. © 2013 IEEE. Source


Kasparek W.,University of Stuttgart | Lechte C.,University of Stuttgart | Plaum B.,University of Stuttgart | Zeitler A.,University of Stuttgart | And 9 more authors.
EPJ Web of Conferences | Year: 2015

For electron cyclotron resonance heating of the stellarator W7-X at IPP Greifswald, a 140 GHz/10 MW cw millimeter wave system is in construction. Two out of 12 launchers will employ a remote-steering design. This paper describes the overall design of the two launchers, and design issues like input coupling structures, manufacturing of corrugated waveguides, optimization of the steering range, integration of vacuum windows, mitrebends and vacuum valves into the launchers, as well as tests of prototype parts. © Owned by the authors, published by EDP Sciences, 2015. Source

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