Journal Article

PreJuSER-34681

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Towards the realization on JET of an integrated H-mode scenario for ITER

Ongena, J. ; Monier-Garbet, P. ; Suttrop, W. ; Andrew, P. ; Becoulet, M. ; Budny, R. ; Corre, Y. ; Cordey, G. ; Dumortier, P. ; Eich, T. ; Garzotti, L. ; Hillis, D. L. ; Hogan, J. ; Ingesson, L. C. ; Jachmich, S. ; Joffrin, E. ; Lang, P. ; Loarte, A. ; Lomas, P. ; Maddison, G. P. ; McDonald, D. ; Messiaen, A. ; Nave, M. F. F. ; Saibene, G. ; Sartori, R. ; Sauter, O. ; Strachan, J. D. ; Unterberg, B.FZJ* ; Valovic, M. ; Voitsekhovitch, I. ; von Hellermann, M. ; Alper, B. ; Baranov, Y. ; Beurskens, M. ; Bonheure, G. ; Brzozowkski, J. ; Bucalossi, J. ; Brix, M. ; Charlet, I. ; Coffey, I. H. ; de Baar, M. ; de Vries, P. ; Giroud, C. ; Gowers, C. W. ; Hawkes, N. ; Jackson, G. L. ; Jupen, C. ; Kallenbach, A. ; Koslowski, H. R. ; Lawson, K. D. ; Mantsinen, M. ; Matthews, G. F. ; Milani, F. ; Murakami, M. ; Murari, D. M. ; Neu, R. ; Parail, V. ; Podda, S. ; Puiatti, M. E. ; Rapp, J.FZJ* ; Righi, E. ; Sartori, F. ; Sarazin, Y. ; Staebler, A. ; Stamp, M. ; Telesca, V. M. ; Valisa, M. ; Weyssow, B. ; Zastrow, K. D.

2004
IAEA Vienna

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Please use a persistent id in citations: http://hdl.handle.net/2128/1820  doi:10.1088/0029-5515/44/1/015

Abstract: ELMy H-mode experiments at JET in 2000/mid-2002 have focused on discharges with normalized parameters for plasma density, energy confinement and beta similar to those of the ITER Q(DT) = 10 reference regime (n/n(GW) similar to 0.85, H-98(y,H-2) similar to 1, beta(N) similar to 1.8). ELMy H-mode plasmas have been realized reaching or even exceeding those parameters in steady-state conditions (up to similar to5 s or 12tau(epsilon)) in a reproducible way and only limited by the duration of the additional heating phase. These results have been obtained (a) in highly triangular plasmas, by increasing the average triangularity delta towards the ITER reference value (delta similar to 0.5), and (b) in plasmas at low triangularity (delta similar to 0.2) by seeding of Ar and placing the X-point of the plasma on the top of the septum. Pellet injection from the high field side is a third method yielding high density and high confinement, albeit not yet under steady-state conditions. In highly triangular plasmas the influence of input power, plasma triangularity and impurity seeding with noble gases has been studied. Density profile peaking at high densities has been obtained in (a) impurity seeded low triangularity discharges, (b) ELMy H-modes with low levels of input power and (c) discharges fuelled with pellet injection from the high field side. New ELM behaviour has been observed in high triangularity discharges at high density, opening a possible route to ELM heat load mitigation, which can be further amplified by Ar impurity seeding. Current extrapolations of the ELM heat load to ITER show possibly a window for Type I ELM operation. Confinement scaling studies indicate an increase in confinement with triangularity and density peaking, and a decrease in confinement with the Greenwald number. In addition, experiments in H isotope and He indicate tau(E) proportional to M(0.19)Z(-0.59). The threshold power for the L-H transition in He plasmas shows the same parametric dependence as in D plasmas, but with a 50% higher absolute value.

Keyword(s): J

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Institut für Plasmaphysik (IPP)

Research Program(s):

1. Kernfusion und Plasmaforschung (E05)

Appears in the scientific report 2004
Notes: This version is available at the following URL: http://dx.doi.org/10.1088/0029-5515/44/1/015

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