Progress towards steady-state operation and real-time control of internal transport barriers in JET
- Litaudon, X.
- Becoulet, A.
- Crisanti, F.
- Wolf, R. C.
- Baranov, Yu. F.
- Barbato, E.
- Becoulet, M.
- Budny, R.
- Castaldo, C.
- Cesario, R.
- Challis, C. D.
- Conway, G. D.
- De Baar, M. R.
- De Vries, P.
- Dux, R.
- Eriksson, L. G.
- Esposito, B.
- Felton, R.
- Fourment, C.
- Frigione, D.
- Garbet, X.
- Giannella, R.
- Giroud, C.
- Gorini, G.
- Hawkes, N. C.
- Hellsten, T.
- Hender, T. C.
- Hennequin, P.
- Hogeweij, G. M. D.
- Huysmans, G. T. A.
- Imbeaux, F.
- Joffrin, E.
- Lomas, P. J.
- Lotte, P.
- Maget, P.
- Mailloux, J.
- Mantica, P.
- Mantsinen, M. J.
- Mazon, D.
- Moreau, D.
- Parail, V.
- Pericoli, V.
- Rachlew, E.
- Riva, M.
- Rimini, F.
- Sarazin, Y.
- Stratton, B. C.
- Tala, T. J. J.
- Tresset, G.
- Tudisco, O.
- Zabeo, L.
- Zastrow, K.-D.
- JET-EFDA Contributors
DOIAbstract
In JET, advanced tokamak research mainly focuses on plasmas with internal transport barriers (ITBs) that are strongly influenced by the current density profile. A previously developed optimized shear regime with low magnetic shear in the plasma centre has been extended to deeply negative magnetic shear configurations. High fusion performance with wide ITBs has been obtained transiently with negative central magnetic shear configuration: HIPB98(y,2) ~ 1.9, βN = 2.4 at Ip = 2.5 MA. At somewhat reduced performance, electron and ion ITBs have been sustained in full current drive operation with 1 MA of bootstrap current: HIPB98(y,2) ~ 1, βN = 1.7 at Ip = 2.0 MA. The ITBs were maintained for up to 11 s for the latter case. This duration, much lar...
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