Effect of toroidal field ripple on the formation of internal transport barriers

P. C. de Vries (Corresponding Author), E. Joffrin, N. C. Hawkes, X. Litaudon, C. D. Challis, Y. Andrew, M. Beurskens, M. Brix, J, Brzozowski, K. Crombe, C. Giroud, J. Hobirk, T. Johnson, J. Lönnroth, Antti Salmi, Tuomas Tala, V. Yavorskij, K.-D. Zastrow, JET-EFDA Contributors

    Research output: Contribution to journalArticleScientificpeer-review

    12 Citations (Scopus)

    Abstract

    The effect of a toroidal field (TF) ripple on the formation and performance of internal transport barriers (ITBs) has been studied in JET. It was found that the TF ripple had a profound effect on the toroidal plasma rotation. An increased TF ripple up to δ = 1% led to a lower rotation and reduced the rotational shear in the region where the ITBs were formed. ITB triggering events were observed in all cases and it is thought that the rotational shear may be less important for this process than, for example, the q-profile. However, the increase in the pressure gradient following the ITB trigger was reduced in discharges with a larger TF ripple and consequently a lower rotational shear. This suggests that toroidal rotation and its shear play a role in the growth of the ITB once it has been triggered.
    Original languageEnglish
    Article number065008
    Number of pages12
    JournalPlasma Physics and Controlled Fusion
    Volume50
    Issue number6
    DOIs
    Publication statusPublished - 2008
    MoE publication typeA1 Journal article-refereed

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    ripples
    shear
    Pressure gradient
    toroidal plasmas
    Plasmas
    pressure gradients
    actuators
    profiles

    Cite this

    de Vries, P. C., Joffrin, E., Hawkes, N. C., Litaudon, X., Challis, C. D., Andrew, Y., ... JET-EFDA Contributors (2008). Effect of toroidal field ripple on the formation of internal transport barriers. Plasma Physics and Controlled Fusion, 50(6), [065008]. https://doi.org/10.1088/0741-3335/50/6/065008
    de Vries, P. C. ; Joffrin, E. ; Hawkes, N. C. ; Litaudon, X. ; Challis, C. D. ; Andrew, Y. ; Beurskens, M. ; Brix, M. ; Brzozowski, J, ; Crombe, K. ; Giroud, C. ; Hobirk, J. ; Johnson, T. ; Lönnroth, J. ; Salmi, Antti ; Tala, Tuomas ; Yavorskij, V. ; Zastrow, K.-D. ; JET-EFDA Contributors. / Effect of toroidal field ripple on the formation of internal transport barriers. In: Plasma Physics and Controlled Fusion. 2008 ; Vol. 50, No. 6.
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    title = "Effect of toroidal field ripple on the formation of internal transport barriers",
    abstract = "The effect of a toroidal field (TF) ripple on the formation and performance of internal transport barriers (ITBs) has been studied in JET. It was found that the TF ripple had a profound effect on the toroidal plasma rotation. An increased TF ripple up to δ = 1{\%} led to a lower rotation and reduced the rotational shear in the region where the ITBs were formed. ITB triggering events were observed in all cases and it is thought that the rotational shear may be less important for this process than, for example, the q-profile. However, the increase in the pressure gradient following the ITB trigger was reduced in discharges with a larger TF ripple and consequently a lower rotational shear. This suggests that toroidal rotation and its shear play a role in the growth of the ITB once it has been triggered.",
    author = "{de Vries}, {P. C.} and E. Joffrin and Hawkes, {N. C.} and X. Litaudon and Challis, {C. D.} and Y. Andrew and M. Beurskens and M. Brix and J, Brzozowski and K. Crombe and C. Giroud and J. Hobirk and T. Johnson and J. L{\"o}nnroth and Antti Salmi and Tuomas Tala and V. Yavorskij and K.-D. Zastrow and {JET-EFDA Contributors}",
    year = "2008",
    doi = "10.1088/0741-3335/50/6/065008",
    language = "English",
    volume = "50",
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    de Vries, PC, Joffrin, E, Hawkes, NC, Litaudon, X, Challis, CD, Andrew, Y, Beurskens, M, Brix, M, Brzozowski, J, Crombe, K, Giroud, C, Hobirk, J, Johnson, T, Lönnroth, J, Salmi, A, Tala, T, Yavorskij, V, Zastrow, K-D & JET-EFDA Contributors 2008, 'Effect of toroidal field ripple on the formation of internal transport barriers', Plasma Physics and Controlled Fusion, vol. 50, no. 6, 065008. https://doi.org/10.1088/0741-3335/50/6/065008

    Effect of toroidal field ripple on the formation of internal transport barriers. / de Vries, P. C. (Corresponding Author); Joffrin, E.; Hawkes, N. C.; Litaudon, X.; Challis, C. D.; Andrew, Y.; Beurskens, M.; Brix, M.; Brzozowski, J,; Crombe, K.; Giroud, C.; Hobirk, J.; Johnson, T.; Lönnroth, J.; Salmi, Antti; Tala, Tuomas; Yavorskij, V.; Zastrow, K.-D.; JET-EFDA Contributors.

    In: Plasma Physics and Controlled Fusion, Vol. 50, No. 6, 065008, 2008.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Effect of toroidal field ripple on the formation of internal transport barriers

    AU - de Vries, P. C.

    AU - Joffrin, E.

    AU - Hawkes, N. C.

    AU - Litaudon, X.

    AU - Challis, C. D.

    AU - Andrew, Y.

    AU - Beurskens, M.

    AU - Brix, M.

    AU - Brzozowski, J,

    AU - Crombe, K.

    AU - Giroud, C.

    AU - Hobirk, J.

    AU - Johnson, T.

    AU - Lönnroth, J.

    AU - Salmi, Antti

    AU - Tala, Tuomas

    AU - Yavorskij, V.

    AU - Zastrow, K.-D.

    AU - JET-EFDA Contributors,

    PY - 2008

    Y1 - 2008

    N2 - The effect of a toroidal field (TF) ripple on the formation and performance of internal transport barriers (ITBs) has been studied in JET. It was found that the TF ripple had a profound effect on the toroidal plasma rotation. An increased TF ripple up to δ = 1% led to a lower rotation and reduced the rotational shear in the region where the ITBs were formed. ITB triggering events were observed in all cases and it is thought that the rotational shear may be less important for this process than, for example, the q-profile. However, the increase in the pressure gradient following the ITB trigger was reduced in discharges with a larger TF ripple and consequently a lower rotational shear. This suggests that toroidal rotation and its shear play a role in the growth of the ITB once it has been triggered.

    AB - The effect of a toroidal field (TF) ripple on the formation and performance of internal transport barriers (ITBs) has been studied in JET. It was found that the TF ripple had a profound effect on the toroidal plasma rotation. An increased TF ripple up to δ = 1% led to a lower rotation and reduced the rotational shear in the region where the ITBs were formed. ITB triggering events were observed in all cases and it is thought that the rotational shear may be less important for this process than, for example, the q-profile. However, the increase in the pressure gradient following the ITB trigger was reduced in discharges with a larger TF ripple and consequently a lower rotational shear. This suggests that toroidal rotation and its shear play a role in the growth of the ITB once it has been triggered.

    U2 - 10.1088/0741-3335/50/6/065008

    DO - 10.1088/0741-3335/50/6/065008

    M3 - Article

    VL - 50

    JO - Plasma Physics and Controlled Fusion

    JF - Plasma Physics and Controlled Fusion

    SN - 0741-3335

    IS - 6

    M1 - 065008

    ER -