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

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    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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    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, 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, 50(6), [065008]. https://doi.org/10.1088/0741-3335/50/6/065008