First results with 3-strap ICRF antennas in ASDEX Upgrade.

Authors :: V. Bobkov
F. Braun
R. Dux
A. Herrmann
H. Faugel
H. Fünfgelder
A. Kallenbach
R. Neu
J.-M. Noterdaeme
R. Ochoukov
Th. Pütterich
A. Tuccilo
O. Tudisco
Y. Wang
Q. Yang
team, ASDEX Upgrade
Source :: Nuclear Fusion; Aug2016, Vol. 56 Issue 8, p1-1, 1p
Publication Year :: 2016
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 and is adopted to minimize the ICRF-specific W release. [ABSTRACT FROM AUTHOR]