Progress towards steady-state operation and real-time control of internal transport barriers in JET

X. Litaudon, A. Bécoulet, F. Crisanti, R. C. Wolf, Yu. F. Baranov, E. Barbato, M. Bécoulet, R. Budny, C. Castaldo, R. Cesario, C. D. Challis, G. D. Conway, M. R. DeBaar, P. DeVries, R. Dux, L. G. Eriksson, B. Esposito, R. Felton, C. Fourment, D. FrigioneX. Garbet, R. Giannella, C. Giroud, G. Gorini, N. C. Hawkes, T. Hellsten, T. C. Hender, P. Hennequin, G. M. D. Hogeweij, G.T.A. Huysmans, F. Imbeaux, E. Joffrin, P. J. Lomas, Ph Lotte, P. Maget, J. Mailloux, P. Mantica, M. J. Mantsinen, D. Mazon, D. Moreau, V. Parail, V. Pericoli, E. Rachlew, M. Riva, F. Rimini, Y. Sarazin, B. C. Stratton, T. J. J. Tala, G. Tresset, O. Tudisco, L. Zabeo, K.-D. Zastrow, JET-EFDA contributors

Research output: Contribution to journalArticleAcademicpeer-review

55 Citations (Scopus)

Abstract

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, betaN = 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, betaN = 1.7 at Ip = 2.0 MA. The ITBs were maintained for up to 11 s for the latter case. This duration, much larger than the energy confinement time (37 times larger), is already approaching a current resistive time. New real-time measurements and feedback control algorithms have been developed and implemented in JET for successfully controlling the ITB dynamics and the current density profile in the highly non-inductive current regime.
Original languageEnglish
Pages (from-to)565-572
JournalNuclear Fusion
Volume43
Issue number7
DOIs
Publication statusPublished - 1 Jul 2003
Externally publishedYes

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