Study of Z-dependence of impurity transport at JET

C. Giroud, C. Angioni, L. Carraro, I.H. Coffey, J. Hobirk, M.E. Puiatti, M. Valisa, A.D. Whiteford, P. Belo, T.M. Biewer, M. Brix, R. Buttery, E. Joffrin, L. Lauro Taroni, K. Lawson, P. Mantica, A. Meigs, V. Naulin, M.G. O'Mullane, K.-D. Zastrow

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1 Citation (Scopus)

Abstract

First results of the database constituted for the study of the Z dependence of impurity transport have been reported. L and H-mode discharges have been studied. No clear difference is observed between L and H-mode in the transport coefficients in the core and at mid-radius. A dependence of the impurity peaking with Z is observed in the core for both L and H-mode and varies between -0.5 to a maximum of 4 m-1 from C to Ni for the discharges studied. In the region between 0.5 and 0.6, the peaking of impurity profile shows a weaker dependence in Z from roughly a maximum of -0.5 to 0.5 m-1 from C to Ni for the studied discharges. The observation of the pinch reversal from inward to outward for Ni [5] was confirmed following the application of ICRF heating power. This pinch reversal is also observed for C, Ne and Ar but is restricted to a change of transport in the plasma core within r/a less 0.25. The change of peaking following the application of ICRF is dependent on the charge of the impurity and is stronger for Ni than for C.
Original languageEnglish
Publication statusPublished - 2007
Externally publishedYes
Event34th European Physical Society Conference on Plasma Physics 2007, EPS 2007 - , Poland
Duration: 1 Jan 2007 → …

Conference

Conference34th European Physical Society Conference on Plasma Physics 2007, EPS 2007
CountryPoland
Period1/1/07 → …

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All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

Cite this

Giroud, C., Angioni, C., Carraro, L., Coffey, I. H., Hobirk, J., Puiatti, M. E., ... Zastrow, K-D. (2007). Study of Z-dependence of impurity transport at JET. Paper presented at 34th European Physical Society Conference on Plasma Physics 2007, EPS 2007, Poland.