TY  - JOUR
AU  - Bobkov, V.
AU  - Aguiam, D.
AU  - Baruzzo, M.
AU  - Borodin, D.
AU  - Borodkina, I.
AU  - Brezinsek, S.
AU  - Coffey, I.
AU  - Colas, L.
AU  - Czarnecka, A.
AU  - Dumortier, P.
AU  - Durodie, F.
AU  - Dux, R.
AU  - Faugel, H.
AU  - Fünfgelder, H.
AU  - Giroud, C.
AU  - Goniche, M.
AU  - Hobirk, J.
AU  - Herrmann, A.
AU  - Jacquot, J.
AU  - Jacquet, Ph.
AU  - Kallenbach, A.
AU  - Krivska, A.
AU  - Klepper, C. C.
AU  - Lerche, E.
AU  - Menmuir, S.
AU  - Milanesio, D.
AU  - Maggiora, R.
AU  - Monakhov, I.
AU  - Nave, F.
AU  - Neu, R.
AU  - Noterdaeme, J.-M.
AU  - Ochoukov, R.
AU  - Pütterich, Th.
AU  - Reinke, M.
AU  - Tuccilo, A.
AU  - Tudisco, O.
AU  - Van Eester, D.
AU  - Wang, Y.
AU  - Yang, Q.
AU  - Zhang, W.
AU  - Delabie, Ephrem
TI  - Progress in reducing ICRF-specific impurity release in ASDEX upgrade and JET
JO  - Nuclear materials and energy
VL  - 12
SN  - 2352-1791
CY  - Amsterdam [u.a.]
PB  - Elsevier
M1  - FZJ-2017-03315
SP  - 1194-1198
PY  - 2016
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000417293300197
DO  - DOI:10.1016/j.nme.2016.10.026
UR  - https://juser.fz-juelich.de/record/829654
ER  -