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@ARTICLE{Bobkov:835986,
author = {Bobkov, V. and Aguiam, D. and Bilato, R. and Brezinsek, S.
and Colas, L. and Faugel, H. and Fünfgelder, H. and
Herrmann, A. and Jacquot, J. and Kallenbach, A. and
Milanesio, D. and Maggiora, R. and Neu, R. and Noterdaeme,
J-M and Ochoukov, R. and Potzel, S. and Pütterich, T. and
Silva, A. and Tierens, W. and Tuccilo, A. and Tudisco, O.
and Yang, Q. and Zhang, W. and Wang, Y.},
title = {{M}aking {ICRF} power compatible with a high-{Z} wall in
{ASDEX} {U}pgrade},
journal = {Plasma physics and controlled fusion},
volume = {59},
number = {1},
issn = {1361-6587},
address = {Bristol},
publisher = {IOP Publ.},
reportid = {FZJ-2017-05111},
pages = {014022 -},
year = {2017},
abstract = {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.},
cin = {IEK-4},
ddc = {530},
cid = {I:(DE-Juel1)IEK-4-20101013},
pnm = {174 - Plasma-Wall-Interaction (POF3-174)},
pid = {G:(DE-HGF)POF3-174},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000387334900003},
doi = {10.1088/0741-3335/59/1/014022},
url = {https://juser.fz-juelich.de/record/835986},
}