Identity physics experiment on internal transport barriers in JT-60U and JET

P. C. De Vries, Y. Sakamoto, X. Litaudon, M. N. A. Beurskens, M. Brix, K. Crombe, T. Fujita, C. Giroud, N. C. Hawkes, N. Hayashi, E. Joffrin, P. Mantica, G. Matsunaga, N. Oyama, V. Parail, A Salmi, K. Shinohara, D. Strintzi, T. Suzuki, M. TakechiH. Takenaga, Tuomas Tala, M. Tsalas, H. Urano, I. Voitsekhovitch, M. Yoshida, JET-EFDA contributors, JT-60 team

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    Abstract

    A series of experiments have been carried out in 2008 at JT-60U and JET to find common characteristics and explain differences between internal transport barriers (ITBs). The identity experiments succeeded in matching the profiles of most dimensionless parameters at the time ITBs were triggered. Thereafter the q-profile development deviated due to differences in non-inductive current density profile, affecting the ITB. Furthermore, the ITBs in JET were more strongly influenced by the H-mode pedestal or edge localized modes. It was found to be difficult to match the plasma rotation characteristics in both devices. However, the wide range of Mach numbers obtained in these experiments shows that the rotation has little effect on the triggering of ITBs in plasmas with reversed magnetic shear. On the other hand the toroidal rotation and more specifically the rotational shear had an impact on the subsequent growth and allowed the formation of strong ITBs.
    Original languageEnglish
    JournalPlasma Physics and Controlled Fusion
    Volume51
    Issue number12
    DOIs
    Publication statusPublished - 2009
    MoE publication typeA1 Journal article-refereed

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    De Vries, P. C., Sakamoto, Y., Litaudon, X., Beurskens, M. N. A., Brix, M., Crombe, K., Fujita, T., Giroud, C., Hawkes, N. C., Hayashi, N., Joffrin, E., Mantica, P., Matsunaga, G., Oyama, N., Parail, V., Salmi, A., Shinohara, K., Strintzi, D., Suzuki, T., ... JT-60 team (2009). Identity physics experiment on internal transport barriers in JT-60U and JET. Plasma Physics and Controlled Fusion, 51(12). https://doi.org/10.1088/0741-3335/51/12/124050