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. De Baar, P. De Vries, 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 journalArticleScientificpeer-review

    56 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, 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 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
    Number of pages8
    JournalNuclear Fusion
    Volume43
    Issue number7
    DOIs
    Publication statusPublished - 1 Jul 2003
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    shear
    current density
    profiles
    configurations
    feedback control
    fusion
    time measurement
    ions
    electrons
    energy

    Keywords

    • JET
    • real-time control

    Cite this

    Litaudon, X., Bécoulet, A., Crisanti, F., Wolf, R. C., Baranov, Y. F., Barbato, E., ... JET-EFDA Contributors (2003). Progress towards steady-state operation and real-time control of internal transport barriers in JET. Nuclear Fusion, 43(7), 565-572. https://doi.org/10.1088/0029-5515/43/7/309
    Litaudon, X. ; Bécoulet, A. ; Crisanti, F. ; Wolf, R. C. ; Baranov, Yu F. ; Barbato, E. ; Bécoulet, 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, Ph ; 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. / Progress towards steady-state operation and real-time control of internal transport barriers in JET. In: Nuclear Fusion. 2003 ; Vol. 43, No. 7. pp. 565-572.
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    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, 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 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.",
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    Litaudon, X, Bécoulet, A, Crisanti, F, Wolf, RC, Baranov, YF, Barbato, E, Bécoulet, M, Budny, R, Castaldo, C, Cesario, R, Challis, CD, Conway, GD, De Baar, MR, De Vries, P, Dux, R, Eriksson, LG, Esposito, B, Felton, R, Fourment, C, Frigione, D, Garbet, X, Giannella, R, Giroud, C, Gorini, G, Hawkes, NC, Hellsten, T, Hender, TC, Hennequin, P, Hogeweij, GMD, Huysmans, GTA, Imbeaux, F, Joffrin, E, Lomas, PJ, Lotte, P, Maget, P, Mailloux, J, Mantica, P, Mantsinen, MJ, Mazon, D, Moreau, D, Parail, V, Pericoli, V, Rachlew, E, Riva, M, Rimini, F, Sarazin, Y, Stratton, BC, Tala, TJJ, Tresset, G, Tudisco, O, Zabeo, L, Zastrow, KD & JET-EFDA Contributors 2003, 'Progress towards steady-state operation and real-time control of internal transport barriers in JET', Nuclear Fusion, vol. 43, no. 7, pp. 565-572. https://doi.org/10.1088/0029-5515/43/7/309

    Progress towards steady-state operation and real-time control of internal transport barriers in JET. / Litaudon, X.; Bécoulet, A.; Crisanti, F.; Wolf, R. C.; Baranov, Yu F.; Barbato, E.; Bécoulet, 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, Ph; 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.

    In: Nuclear Fusion, Vol. 43, No. 7, 01.07.2003, p. 565-572.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Progress towards steady-state operation and real-time control of internal transport barriers in JET

    AU - Litaudon, X.

    AU - Bécoulet, A.

    AU - Crisanti, F.

    AU - Wolf, R. C.

    AU - Baranov, Yu F.

    AU - Barbato, E.

    AU - Bécoulet, M.

    AU - Budny, R.

    AU - Castaldo, C.

    AU - Cesario, R.

    AU - Challis, C. D.

    AU - Conway, G. D.

    AU - De Baar, M. R.

    AU - De Vries, P.

    AU - Dux, R.

    AU - Eriksson, L. G.

    AU - Esposito, B.

    AU - Felton, R.

    AU - Fourment, C.

    AU - Frigione, D.

    AU - Garbet, X.

    AU - Giannella, R.

    AU - Giroud, C.

    AU - Gorini, G.

    AU - Hawkes, N. C.

    AU - Hellsten, T.

    AU - Hender, T. C.

    AU - Hennequin, P.

    AU - Hogeweij, G. M.D.

    AU - Huysmans, G. T.A.

    AU - Imbeaux, F.

    AU - Joffrin, E.

    AU - Lomas, P. J.

    AU - Lotte, Ph

    AU - Maget, P.

    AU - Mailloux, J.

    AU - Mantica, P.

    AU - Mantsinen, M. J.

    AU - Mazon, D.

    AU - Moreau, D.

    AU - Parail, V.

    AU - Pericoli, V.

    AU - Rachlew, E.

    AU - Riva, M.

    AU - Rimini, F.

    AU - Sarazin, Y.

    AU - Stratton, B. C.

    AU - Tala, T. J.J.

    AU - Tresset, G.

    AU - Tudisco, O.

    AU - Zabeo, L.

    AU - Zastrow, K. D.

    AU - JET-EFDA Contributors,

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    Y1 - 2003/7/1

    N2 - 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 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.

    AB - 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 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.

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    KW - real-time control

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    Litaudon X, Bécoulet A, Crisanti F, Wolf RC, Baranov YF, Barbato E et al. Progress towards steady-state operation and real-time control of internal transport barriers in JET. Nuclear Fusion. 2003 Jul 1;43(7):565-572. https://doi.org/10.1088/0029-5515/43/7/309