Development of an ICRH antenna system at W7-X for plasma heating and wall conditioning

Schweer, B.; Neubauer, O.; Durodier, F.; Messian, A.; Hartmann, D.; Borsuk, V.; Louche, F.; Offermanns, G.; Hollfeld, K. P.; Ongena, J.; Vervier, M.

doi:10.1016/j.fusengdes.2017.05.019

Journal Article

FZJ-2017-06342

Development of an ICRH antenna system at W7-X for plasma heating and wall conditioning

Schweer, B. (Corresponding author)FZJ* ; Borsuk, V.FZJ* ; Durodier, F. ; Ongena, J.FZJ* ; Vervier, M.FZJ* ; Louche, F. ; Messian, A. ; Hartmann, D. ; Hollfeld, K. P.FZJ* ; Neubauer, O.FZJ* ; Offermanns, G.FZJ*

2017
Elsevier New York, NY [u.a.]

29th Symposium on Fusion Technology (SOFT 2016), Prague, Czech Republic, 5 Sep 2016 - 9 Sep 2016 Fusion engineering and design 123, 303-308 (2017) [10.1016/j.fusengdes.2017.05.019]

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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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