Internal transport barrier dynamics with plasma rotation in JET

P.C. de Vries, E. Joffrin, M. Brix, C.D. Challis, K. Crombé, B, Esposito, N.C. Hawkes, C. Giroud, J. Hobirk, J. Lönnroth, P. Mantica, D. Strintzi, Tuomas Tala, I. Voitsekhovitch, JET-EFDA Contributores

    Research output: Contribution to journalArticleScientificpeer-review

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    Abstract

    At JET the dynamics of internal transport barriers (ITBs) has been explored by trying to decouple the effects of heating on the one hand and torque on the other with the ultimate objective of identifying the minimum torque required for the formation of transport barriers. The experiments shed light on the physics behind the initial trigger for ITBs, which often shows to be linked to the shape of the q profile and magnetic shear, while the further development was influenced by the strength of the rotational shear. In discharges with a small amount of rotational shear ITBs were triggered, which suggest that the overall rotational shear is not the dominant factor in the triggering process. However, the subsequent growth of the barrier was limited if the rotational shear was too low at the time of triggering. This growth phase may be highly non-linear, with several possible positive feedback loops, such as the increases in the toroidal and poloidal component of the rotational shear caused by the ITB itself.
    Original languageEnglish
    Article number075007
    JournalNuclear Fusion
    Volume49
    Issue number7
    DOIs
    Publication statusPublished - 2009
    MoE publication typeA1 Journal article-refereed

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    shear
    torque
    positive feedback
    actuators
    physics
    heating
    profiles

    Cite this

    de Vries, P. C., Joffrin, E., Brix, M., Challis, C. D., Crombé, K., Esposito, B., ... Contributores, JET-EFDA. (2009). Internal transport barrier dynamics with plasma rotation in JET. Nuclear Fusion, 49(7), [075007]. https://doi.org/10.1088/0029-5515/49/7/075007
    de Vries, P.C. ; Joffrin, E. ; Brix, M. ; Challis, C.D. ; Crombé, K. ; Esposito, B, ; Hawkes, N.C. ; Giroud, C. ; Hobirk, J. ; Lönnroth, J. ; Mantica, P. ; Strintzi, D. ; Tala, Tuomas ; Voitsekhovitch, I. ; Contributores, JET-EFDA. / Internal transport barrier dynamics with plasma rotation in JET. In: Nuclear Fusion. 2009 ; Vol. 49, No. 7.
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    title = "Internal transport barrier dynamics with plasma rotation in JET",
    abstract = "At JET the dynamics of internal transport barriers (ITBs) has been explored by trying to decouple the effects of heating on the one hand and torque on the other with the ultimate objective of identifying the minimum torque required for the formation of transport barriers. The experiments shed light on the physics behind the initial trigger for ITBs, which often shows to be linked to the shape of the q profile and magnetic shear, while the further development was influenced by the strength of the rotational shear. In discharges with a small amount of rotational shear ITBs were triggered, which suggest that the overall rotational shear is not the dominant factor in the triggering process. However, the subsequent growth of the barrier was limited if the rotational shear was too low at the time of triggering. This growth phase may be highly non-linear, with several possible positive feedback loops, such as the increases in the toroidal and poloidal component of the rotational shear caused by the ITB itself.",
    author = "{de Vries}, P.C. and E. Joffrin and M. Brix and C.D. Challis and K. Cromb{\'e} and B, Esposito and N.C. Hawkes and C. Giroud and J. Hobirk and J. L{\"o}nnroth and P. Mantica and D. Strintzi and Tuomas Tala and I. Voitsekhovitch and JET-EFDA Contributores",
    year = "2009",
    doi = "10.1088/0029-5515/49/7/075007",
    language = "English",
    volume = "49",
    journal = "Nuclear Fusion",
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    de Vries, PC, Joffrin, E, Brix, M, Challis, CD, Crombé, K, Esposito, B, Hawkes, NC, Giroud, C, Hobirk, J, Lönnroth, J, Mantica, P, Strintzi, D, Tala, T, Voitsekhovitch, I & Contributores, JET-EFDA 2009, 'Internal transport barrier dynamics with plasma rotation in JET', Nuclear Fusion, vol. 49, no. 7, 075007. https://doi.org/10.1088/0029-5515/49/7/075007

    Internal transport barrier dynamics with plasma rotation in JET. / de Vries, P.C.; Joffrin, E.; Brix, M.; Challis, C.D.; Crombé, K.; Esposito, B,; Hawkes, N.C.; Giroud, C.; Hobirk, J.; Lönnroth, J.; Mantica, P.; Strintzi, D.; Tala, Tuomas; Voitsekhovitch, I.; Contributores, JET-EFDA.

    In: Nuclear Fusion, Vol. 49, No. 7, 075007, 2009.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Internal transport barrier dynamics with plasma rotation in JET

    AU - de Vries, P.C.

    AU - Joffrin, E.

    AU - Brix, M.

    AU - Challis, C.D.

    AU - Crombé, K.

    AU - Esposito, B,

    AU - Hawkes, N.C.

    AU - Giroud, C.

    AU - Hobirk, J.

    AU - Lönnroth, J.

    AU - Mantica, P.

    AU - Strintzi, D.

    AU - Tala, Tuomas

    AU - Voitsekhovitch, I.

    AU - Contributores, JET-EFDA

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    AB - At JET the dynamics of internal transport barriers (ITBs) has been explored by trying to decouple the effects of heating on the one hand and torque on the other with the ultimate objective of identifying the minimum torque required for the formation of transport barriers. The experiments shed light on the physics behind the initial trigger for ITBs, which often shows to be linked to the shape of the q profile and magnetic shear, while the further development was influenced by the strength of the rotational shear. In discharges with a small amount of rotational shear ITBs were triggered, which suggest that the overall rotational shear is not the dominant factor in the triggering process. However, the subsequent growth of the barrier was limited if the rotational shear was too low at the time of triggering. This growth phase may be highly non-linear, with several possible positive feedback loops, such as the increases in the toroidal and poloidal component of the rotational shear caused by the ITB itself.

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    DO - 10.1088/0029-5515/49/7/075007

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    SN - 0029-5515

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    de Vries PC, Joffrin E, Brix M, Challis CD, Crombé K, Esposito B et al. Internal transport barrier dynamics with plasma rotation in JET. Nuclear Fusion. 2009;49(7). 075007. https://doi.org/10.1088/0029-5515/49/7/075007