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

    Research output: Contribution to journalArticleScientificpeer-review

    59 Citations (Scopus)

    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

    Fingerprint

    Mach number
    Momentum
    momentum
    Prandtl number
    Plasmas
    diffusivity
    heat
    Ions
    ion temperature
    profiles
    Discharge (fluid mechanics)
    temperature profiles
    unity
    deviation
    Temperature
    thresholds
    ions
    Hot Temperature

    Keywords

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

    Cite this

    de Vries, P. C., Rantamäki, K. M., Asp, E., Corrigan, G., Eriksson, A., Giroud, C., ... 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
    de Vries, P.C. ; Rantamäki, Karin M. ; Asp, E. ; Corrigan, G. ; Eriksson, A. ; Giroud, C. ; Knoops, H.C.M. ; Mantica, P. ; Nordman, H. ; Strand, P. ; Tala, Tuomas ; Weiland, J. ; Zastrow, K.-D. ; JET-EFDA Contributors. / Plasma rotation and momentum transport studies at JET. In: Plasma Physics and Controlled Fusion. 2006 ; Vol. 48, No. 12. pp. 1693-1708.
    @article{dfec13978c624c4a860a968daf00e708,
    title = "Plasma rotation and momentum transport studies at JET",
    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.",
    keywords = "JET, plasma, plasma simulation, fusion energy, fusion reactors, tokamak, ITER, internal transport barriers",
    author = "{de Vries}, P.C. and Rantam{\"a}ki, {Karin M.} and E. Asp and G. Corrigan and A. Eriksson and C. Giroud and H.C.M. Knoops and P. Mantica and H. Nordman and P. Strand and Tuomas Tala and J. Weiland and K.-D. Zastrow and {JET-EFDA Contributors}",
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    language = "English",
    volume = "48",
    pages = "1693--1708",
    journal = "Plasma Physics and Controlled Fusion",
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    de Vries, PC, Rantamäki, KM, Asp, E, Corrigan, G, Eriksson, A, Giroud, C, Knoops, HCM, 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, vol. 48, no. 12, pp. 1693-1708. https://doi.org/10.1088/0741-3335/48/12/001

    Plasma rotation and momentum transport studies at JET. / de Vries, P.C.; Rantamäki, Karin M.; Asp, E.; Corrigan, G.; Eriksson, A.; Giroud, C.; Knoops, H.C.M.; Mantica, P.; Nordman, H.; Strand, P.; Tala, Tuomas; Weiland, J.; Zastrow, K.-D.; JET-EFDA Contributors.

    In: Plasma Physics and Controlled Fusion, Vol. 48, No. 12, 2006, p. 1693-1708.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Plasma rotation and momentum transport studies at JET

    AU - de Vries, P.C.

    AU - Rantamäki, Karin M.

    AU - Asp, E.

    AU - Corrigan, G.

    AU - Eriksson, A.

    AU - Giroud, C.

    AU - Knoops, H.C.M.

    AU - Mantica, P.

    AU - Nordman, H.

    AU - Strand, P.

    AU - Tala, Tuomas

    AU - Weiland, J.

    AU - Zastrow, K.-D.

    AU - JET-EFDA Contributors,

    PY - 2006

    Y1 - 2006

    N2 - 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.

    AB - 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.

    KW - JET

    KW - plasma

    KW - plasma simulation

    KW - fusion energy

    KW - fusion reactors

    KW - tokamak

    KW - ITER

    KW - internal transport barriers

    U2 - 10.1088/0741-3335/48/12/001

    DO - 10.1088/0741-3335/48/12/001

    M3 - Article

    VL - 48

    SP - 1693

    EP - 1708

    JO - Plasma Physics and Controlled Fusion

    JF - Plasma Physics and Controlled Fusion

    SN - 0741-3335

    IS - 12

    ER -

    de Vries PC, Rantamäki KM, Asp E, Corrigan G, Eriksson A, Giroud C et al. Plasma rotation and momentum transport studies at JET. Plasma Physics and Controlled Fusion. 2006;48(12):1693-1708. https://doi.org/10.1088/0741-3335/48/12/001