Progress in reducing ICRF-specific impurity release in ASDEX upgrade and JET

Bobkov, V.; Herrmann, A.; Coffey, I.; Dux, R.; Delabie, Ephrem; Klepper, C. C.; Faugel, H.; Dumortier, P.; Fünfgelder, H.; Milanesio, D.; Wang, Y.; Brezinsek, S.; Jacquot, J.; Menmuir, S.; Yang, Q.; Goniche, M.; Durodie, F.; Reinke, M.; Baruzzo, M.; Lerche, E.; Noterdaeme, J.-M.; Krivska, A.; Zhang, W.; Van Eester, D.; Ochoukov, R.; Neu, R.; Giroud, C.; Nave, F.; Kallenbach, A.; Tudisco, O.; Hobirk, J.; Pütterich, Th.; Maggiora, R.; Monakhov, I.; Borodin, D.; Aguiam, D.; Colas, L.; Tuccilo, A.; Borodkina, I.; Czarnecka, A.; Jacquet, Ph.

doi:10.1016/j.nme.2016.10.026

Journal Article

FZJ-2017-03315

Progress in reducing ICRF-specific impurity release in ASDEX upgrade and JET

Bobkov, V. (Corresponding author) ; Aguiam, D. ; Baruzzo, M. ; Borodin, D.FZJ* ; Borodkina, I.FZJ* ; Brezinsek, S.FZJ* ; Coffey, I. ; Colas, L. ; Czarnecka, A. ; Dumortier, P.FZJ* ; Durodie, F.FZJ* ; Dux, R. ; Faugel, H. ; Fünfgelder, H. ; Giroud, C. ; Goniche, M. ; Hobirk, J. ; Herrmann, A. ; Jacquot, J. ; Jacquet, P. ; Kallenbach, A. ; Krivska, A. ; Klepper, C. C. ; Lerche, E. ; Menmuir, S. ; Milanesio, D. ; Maggiora, R. ; Monakhov, I. ; Nave, F. ; Neu, R. ; Noterdaeme, J.-M. ; Ochoukov, R. ; Pütterich, T. ; Reinke, M. ; Tuccilo, A. ; Tudisco, O. ; Van Eester, D.FZJ* ; Wang, Y.FZJ* ; Yang, Q. ; Zhang, W. ; Delabie, E.FZJ*

2016
Elsevier Amsterdam [u.a.]

Nuclear materials and energy 12, 1194-1198 (2016) [10.1016/j.nme.2016.10.026]

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Please use a persistent id in citations: http://hdl.handle.net/2128/15864 doi:10.1016/j.nme.2016.10.026

Abstract: 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.

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