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          Institute: MPI für Plasmaphysik     Collection: Articles, Books, Inbooks     Display Documents



ID: 20216.0, MPI für Plasmaphysik / Articles, Books, Inbooks
Resonant Faraday shield ICRH antenna
Authors:Cattanei, G.; W7-AS Team
Language:English
Date of Publication (YYYY-MM-DD):2002-05
Title of Journal:Nuclear Fusion
Journal Abbrev.:Nucl. Fusion
Volume:42
Issue / Number:5
Start Page:541
End Page:546
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:ICRH has proved to be an efficient method of heating the plasma in toroidal devices. The high voltages needed at the coupling structure are, however, a severe handicap of this method. The possibility is investigated of having the highest voltages between the bars of the Faraday shield (FS), where they are both necessary and easier to maintain. For this purpose a resonant Faraday shield (RFS) antenna where the first and last bars of the FS are connected by an inductive strip is proposed. In front of this strip there is a second strip, fed, as in a conventional antenna, by an RF generator. It is shown that if the toroidal length of the FS is larger lambda/2 the strip connecting the bars of the FS acts as the secondary coil of a tuned transformer, the strip fed by the generator being the primary. It is therefore possible, by varying the frequency and the distance between the two strips, i.e. the coupling coefficient, to match the impedance of the primary to that of the generator.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Plasmaphysik/E3
Identifiers:ISI:000176429800006
ISSN:0029-5515
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