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100 1 _ |0 P:(DE-Juel1)130154
|a Schweer, B.
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111 2 _ |a 29th Symposium on Fusion Technology (SOFT 2016)
|c Prague
|d 2016-09-05 - 2016-09-09
|w Czech Republic
245 _ _ |a Development of an ICRH antenna system at W7-X for plasma heating and wall conditioning
260 _ _ |a New York, NY [u.a.]
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520 _ _ |a 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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