%0 Journal Article
%A Bobkov, V.
%A Aguiam, D.
%A Baruzzo, M.
%A Borodin, D.
%A Borodkina, I.
%A Brezinsek, S.
%A Coffey, I.
%A Colas, L.
%A Czarnecka, A.
%A Dumortier, P.
%A Durodie, F.
%A Dux, R.
%A Faugel, H.
%A Fünfgelder, H.
%A Giroud, C.
%A Goniche, M.
%A Hobirk, J.
%A Herrmann, A.
%A Jacquot, J.
%A Jacquet, Ph.
%A Kallenbach, A.
%A Krivska, A.
%A Klepper, C. C.
%A Lerche, E.
%A Menmuir, S.
%A Milanesio, D.
%A Maggiora, R.
%A Monakhov, I.
%A Nave, F.
%A Neu, R.
%A Noterdaeme, J.-M.
%A Ochoukov, R.
%A Pütterich, Th.
%A Reinke, M.
%A Tuccilo, A.
%A Tudisco, O.
%A Van Eester, D.
%A Wang, Y.
%A Yang, Q.
%A Zhang, W.
%A Delabie, Ephrem
%T Progress in reducing ICRF-specific impurity release in ASDEX upgrade and JET
%J Nuclear materials and energy
%V 12
%@ 2352-1791
%C Amsterdam [u.a.]
%I Elsevier
%M FZJ-2017-03315
%P 1194-1198
%D 2016
%X Use of new 3-strap ICRF antennas with all-tungsten (W) limiters in ASDEX Upgrade results in a reduction of the W sources at the antenna limiters and of the W content in the confined plasma by at least a factor of 2 compared to the W-limiter 2-strap antennas used in the past. The reduction is observed with a broad range of plasma shapes. In multiple locations of antenna frame, the limiter W source has a minimum when RF image currents are decreased by cancellation of the RF current contributions of the central and the outer straps. In JET with ITER-like wall, ITER-like antenna produces about 20% less of main chamber radiation and of W content compared to the old A2 antennas. However the effect of the A2 antennas on W content is scattered depending on which antennas are powered. Experiments in JET with trace nitrogen (N2) injection show that a presence of active ICRF antenna close to the midplane injection valve has little effect on the core N content, both in dipole and in -90° phasing. This indicates that the effect of ICRF on impurity transport across the scape-off-layer is small in JET compared to the dominant effect on impurity sources leading to increased impurity levels during ICRF operation.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000417293300197
%R 10.1016/j.nme.2016.10.026
%U https://juser.fz-juelich.de/record/829654