Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6744381 | Fusion Engineering and Design | 2017 | 6 Pages |
Abstract
An ICRH antenna system is under construction to be ready for use in the operational phase 1.2 of W7-X. A two strap antenna, with a surface adapted to the 3D shape of the Last Closed Flux Surface (LCFS) of the standard magnetic configuration (m/n = 5/5), will be installed in the equatorial plane on the low field side of W7-X. The antenna system is optimised for plasma heating and wall conditioning in presence of the magnetic field in the frequency range 25-38 MHz. Each strap is short-circuited on one end, is pre-matched using a tunable capacitor on the other end with connection to the RF power source about halfway in the poloidal direction. To allow optimal coupling to different magnetic configurations in W7-X the antenna can be moved radially over a distance of 350 mm. The cooling circuits in the antenna head are designed to sustain cw W7-X plasma operation in a retracted position and 2 MW ICRH pulses with maximum 10 s duration every 300 s close to the LCFS.
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Authors
B. Schweer, J. Ongena, V. Borsuk, D. Birus, S. Bozhenkov, D. Castaño Bardawil, F. Durodié, D. Hartmann, K.P. Hollfeld, P. Kallmeyer, A. Krivska, F. Louche, A. Messiaen, O. Neubauer, G. Offermanns, G. Satheeswaran, M. Van Schoor, M. Vervier, R. Wolf,