Towards fully non-inductive current drive operation in JET

X. Litaudon, F. Crisanti, B. Alper, J.F. Artaud, Y.F. Baranov, E. Barbato, V. Basiuk, A. Bécoulet, M. Bécoulet, C. Castaldo, C.D. Challis, G.D. Conway, R. Dux, L.G. Eriksson, B. Esposito, C. Fourment, D. Frigione, X. Garbet, C. Giroud, N.C. HawkesP. Hennequin, G.T.A. Huysmans, F. Imbeaux, E. Joffrin, P.J. Lomas, P. Lotte, P. Maget, M. Mantsinen, B.J. Mailloux, D. Mazon, F.P. Milani, D.J.J.S.M. Moreau, V. Parail, E. Pohn, F.G. Rimini, Y. Sarazin, G. Tresset, K.D. Zastrow, M. Zerbini, contributors to the EFDA-JET Workprogramme

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80 Citations (Scopus)


Quasi-steady operation has been achieved at JET in the high-confinement regime with internal transport barriers (ITBs). The ITB has been maintained up to 11 s. This duration, much larger than the energy confinement time, is already approaching a current resistive time. The high-performance phase is limited only by plant constraints. The radial profiles of the thermal electron and ion pressures have steep gradients typically at mid-plasma radius. A large fraction of non-inductive current (above 80%) is sustained throughout the high-performance phase with a poloidal beta exceeding unity. The safety factor profile plays an important role in sustaining the ITB characteristics. In this regime where the self-generated bootstrap current (up to 1.0 MA) represents 50% of the total current, the resistive evolution of the non-monotonic q-profile is slowed down by using off-axis lower-hybrid current drive.
Original languageEnglish
Pages (from-to)1057-1086
JournalPlasma Physics and Controlled Fusion
Issue number7
Publication statusPublished - 1 Jul 2002
Externally publishedYes


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