Design of long-pulse fast wave current drive antennas for DIII-D

Baity, F. W.; Batchelor, D. B.; Bills, K. C.; Fogelman, C.H.; Jaeger, E. F.; Jiang, Ping; Riemer, Bernie; Ryan, P. M.; Stallings, D. C.; Taylor, Douglas; Yugo, J.J.

doi:10.1063/1.44956

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“…There are two long-pulse four-element fast wave current drive antenna arrays on DIII-D, referred to as the 00 and 1800 antennas for their toroidal locations on the tokamak [1]. A schematic drawing is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Vulnerability of Feedthroughs Operated at a Low-Impedance Point on DIII-D

Baity

Pinsker

Fredd

et al. 2005

21st IEEE/NPS Symposium on Fusion Engineering SOFE 05

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Two vacuum feedthrough ceramics failed in separate incidents on DIII-D when operating at high power with the feedthrough near a low-voltage point in the transmission line. In each case a sustained arc in the feedthrough was not detected by the arc protection circuit because the impedance seen by directional couplers upstream was nearly the same as that observed with no arc. A different arc detection methodology is needed when operating with the vacuum feedthrough at a low-voltage point than the more usual situation with the vacuum feedthrough at high-voltage.

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Section: Introductionmentioning

confidence: 99%