TY  - JOUR
AU  - Bobkov, V.
AU  - Aguiam, D.
AU  - Bilato, R.
AU  - Brezinsek, S.
AU  - Colas, L.
AU  - Faugel, H.
AU  - Fünfgelder, H.
AU  - Herrmann, A.
AU  - Jacquot, J.
AU  - Kallenbach, A.
AU  - Milanesio, D.
AU  - Maggiora, R.
AU  - Neu, R.
AU  - Noterdaeme, J-M
AU  - Ochoukov, R.
AU  - Potzel, S.
AU  - Pütterich, T.
AU  - Silva, A.
AU  - Tierens, W.
AU  - Tuccilo, A.
AU  - Tudisco, O.
AU  - Yang, Q.
AU  - Zhang, W.
AU  - Wang, Y.
TI  - Making ICRF power compatible with a high-Z wall in ASDEX Upgrade
JO  - Plasma physics and controlled fusion
VL  - 59
IS  - 1
SN  - 1361-6587
CY  - Bristol
PB  - IOP Publ.
M1  - FZJ-2017-05111
SP  - 014022 -
PY  - 2017
AB  - A comparison of the ASDEX Upgrade 3-strap ICRF antenna data with the linear electro-magnetic TOPICA calculations is presented. The comparison substantiates a reduction of the local electric field at the radially protruding plasma-facing elements of the antenna as a relevant approach for minimizing tungsten (W) sputtering in conditions when the slow wave is strongly evanescent. The measured reaction of the time-averaged RF current at the antenna limiters to the antenna feeding variations is less sensitive than predicted by the calculations. This is likely to have been caused by temporal and spatial fluctuations in the 3D plasma density distribution affected by local non-linear interactions. The 3-strap antenna with the W-coated limiters produces drastically less W sputtering compared to the W-coated 2-strap antennas. This is consistent with the non-linear asymptotic SSWICH-SW calculations for RF sheaths.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000387334900003
DO  - DOI:10.1088/0741-3335/59/1/014022
UR  - https://juser.fz-juelich.de/record/835986
ER  -