First results with 3-strap ICRF antennas in ASDEX Upgrade
- 5 July 2016
- journal article
- letter
- Published by IOP Publishing in Nuclear Fusion
- Vol. 56 (8), 084001
- https://doi.org/10.1088/0029-5515/56/8/084001
Abstract
The 3-strap antennas in ASDEX Upgrade allow ICRF operation with low tungsten (W) content in the confined plasma with W-coated antenna limiters. With the 3-strap antenna configuration, the local W impurity source at the antenna is drastically reduced and the core W concentration is similar to that of the boron coated 2-strap antenna at a given ICRF power. Operation of the 3-strap antennas with the power ratio between the central and the outer straps of 1.5 : 1 and 2 : 1 is adopted to minimize the ICRF-specific W release.Keywords
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