Evolution of the radial electric field in a JET H-mode plasma

Y. Andrew, N.C. Hawkes, T. Biewer, K. Crombe, D. Keeling, E. De La Luna, C. Giroud, A. Korotkov, A. Meigs, A. Murari, I. Nunes, R. Sartori, Tuomas Tala, JET-EFDA Contributors

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    Abstract

    Results from recent measurements of carbon impurity ion toroidal and poloidal rotation velocities, ion temperature, ion density and the resulting radial electric field (Er) profiles are presented from an evolving Joint European Torus (JET) tokamak plasma over a range of energy and particle confinement regimes. Significant levels of edge plasma poloidal rotation velocity have been measured for the first time on JET, with maximum values of ±9 km s- 1. Such values of poloidal rotation provide an important contribution to the total edge plasma Er profiles. Large values of shear in the measured Er profiles are observed to arise as a consequence of the presence of the edge transport barrier (ETB) and do not appear to be necessary for their formation or destruction. These results have an important impact on potential mechanisms for transport barrier triggering and sustainment in present-day and future high-performance fusion plasmas.
    Original languageEnglish
    Article number15003
    JournalEurophysics Letters
    Volume83
    Issue number1
    DOIs
    Publication statusPublished - 2008
    MoE publication typeA1 Journal article-refereed

    Keywords

    • plasma
    • fusion plasma
    • JET
    • fusion energy
    • plasma toroidal confinement
    • poloidal momentum transport
    • poloidal velocity
    • tokamak

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    Andrew, Y., Hawkes, N. C., Biewer, T., Crombe, K., Keeling, D., De La Luna, E., Giroud, C., Korotkov, A., Meigs, A., Murari, A., Nunes, I., Sartori, R., Tala, T., & JET-EFDA Contributors (2008). Evolution of the radial electric field in a JET H-mode plasma. Europhysics Letters, 83(1), [15003]. https://doi.org/10.1209/0295-5075/83/15003