Plasma rotation and momentum transport studies at JET

P.C. de Vries, Karin M. Rantamäki, E. Asp, G. Corrigan, A. Eriksson, C. Giroud, H.C.M. Knoops, P. Mantica, H. Nordman, P. Strand, Tuomas Tala, J. Weiland, K.-D. Zastrow, JET-EFDA Contributors

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    Abstract

    An experimental study in plasma rotation and momentum transport was carried out at JET. The toroidal rotation profile was found to scale approximately with that of the ion temperature. However, significant deviations from this were found in high density ELMy H-mode discharges, which had broader rotation profiles. A rotation database analysis showed the variation of the dimensionless Mach number with respect to the plasma scenario. For predominantly NBI heated discharges the Mach number was found to be in the range of 0.3–0.45. Larger Mach numbers were observed in type I ELMy H-modes, while scenarios exhibiting type III ELMs or L-mode had lower Mach numbers. Advanced scenarios often showed a significant increase in the central Mach number when an internal transport barrier formed. A detailed study was done to investigate the Prandtl number, Pr, defined as the ratio between momentum and ion heat diffusivity. Generally the Prandtl number was found to be significantly below unity, e.g. 0.18 < Pr < 0.35. Although it is often predicted that momentum and heat diffusivity are equal in ITG dominated plasma, also for high density ELMy H-mode discharges with temperature profiles close and above the ITG threshold, the Prandtl number was Pr ~ 0.3.
    Original languageEnglish
    Pages (from-to)1693-1708
    Number of pages16
    JournalPlasma Physics and Controlled Fusion
    Volume48
    Issue number12
    DOIs
    Publication statusPublished - 2006
    MoE publication typeA1 Journal article-refereed

    Keywords

    • JET
    • plasma
    • plasma simulation
    • fusion energy
    • fusion reactors
    • tokamak
    • ITER
    • internal transport barriers

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  • Cite this

    de Vries, P. C., Rantamäki, K. M., Asp, E., Corrigan, G., Eriksson, A., Giroud, C., Knoops, H. C. M., Mantica, P., Nordman, H., Strand, P., Tala, T., Weiland, J., Zastrow, K-D., & JET-EFDA Contributors (2006). Plasma rotation and momentum transport studies at JET. Plasma Physics and Controlled Fusion, 48(12), 1693-1708. https://doi.org/10.1088/0741-3335/48/12/001