Momentum transport studies in JET H-mode discharges with an enhanced toroidal field ripple

JET-EFDA collaborators

    Research output: Contribution to journalArticleScientificpeer-review

    15 Citations (Scopus)

    Abstract

    In this study, enhancement of the toroidal field (TF) ripple has been used as a tool in order to reveal the impact of the momentum pinch on the rotation profiles in H-mode JET discharges. The analysis showed that flatter rotation profiles were obtained in discharges with a high TF ripple, attributed to a smaller inward momentum convection. An average inward momentum pinch of approximately Vp ≈ 3.4 m s−1 and a normalized pinch value of RVp/χ ≈ 6.6 could explain the observation. The data show that the momentum at the edge affects the peaking of the rotation and momentum density profiles. Under the assumption that the heat and momentum diffusivities are equal, an estimate of the levels of the momentum pinch in all discharges in the JET rotation database was made. For H-mode discharge these ranged from 0.3 m s−1 < Vp < 17 m s−1, with 2 < RVp/χ < 10. A larger momentum pinch was found in discharges with a smaller density profile gradient length, i.e. a more peaked density profile.
    Original languageEnglish
    Article number065004
    Number of pages11
    JournalPlasma Physics and Controlled Fusion
    Volume52
    Issue number6
    DOIs
    Publication statusPublished - 2010
    MoE publication typeA1 Journal article-refereed

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    ripples
    Momentum
    momentum
    profiles
    diffusivity
    convection
    heat
    gradients
    augmentation
    estimates

    Cite this

    @article{6827d4895f1e472396395d96f536612f,
    title = "Momentum transport studies in JET H-mode discharges with an enhanced toroidal field ripple",
    abstract = "In this study, enhancement of the toroidal field (TF) ripple has been used as a tool in order to reveal the impact of the momentum pinch on the rotation profiles in H-mode JET discharges. The analysis showed that flatter rotation profiles were obtained in discharges with a high TF ripple, attributed to a smaller inward momentum convection. An average inward momentum pinch of approximately Vp ≈ 3.4 m s−1 and a normalized pinch value of RVp/χ ≈ 6.6 could explain the observation. The data show that the momentum at the edge affects the peaking of the rotation and momentum density profiles. Under the assumption that the heat and momentum diffusivities are equal, an estimate of the levels of the momentum pinch in all discharges in the JET rotation database was made. For H-mode discharge these ranged from 0.3 m s−1 < Vp < 17 m s−1, with 2 < RVp/χ < 10. A larger momentum pinch was found in discharges with a smaller density profile gradient length, i.e. a more peaked density profile.",
    author = "{de Vries}, {P. C.} and Versloot, {T. W.} and Antti Salmi and M.-D. Hua and Howell, {D. H.} and C. Giroud and V. Parail and G. Saibene and Tuomas Tala and {JET-EFDA collaborators}",
    year = "2010",
    doi = "10.1088/0741-3335/52/6/065004",
    language = "English",
    volume = "52",
    journal = "Plasma Physics and Controlled Fusion",
    issn = "0741-3335",
    publisher = "Institute of Physics IOP",
    number = "6",

    }

    Momentum transport studies in JET H-mode discharges with an enhanced toroidal field ripple. / JET-EFDA collaborators.

    In: Plasma Physics and Controlled Fusion, Vol. 52, No. 6, 065004, 2010.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Momentum transport studies in JET H-mode discharges with an enhanced toroidal field ripple

    AU - de Vries, P. C.

    AU - Versloot, T. W.

    AU - Salmi, Antti

    AU - Hua, M.-D.

    AU - Howell, D. H.

    AU - Giroud, C.

    AU - Parail, V.

    AU - Saibene, G.

    AU - Tala, Tuomas

    AU - JET-EFDA collaborators

    PY - 2010

    Y1 - 2010

    N2 - In this study, enhancement of the toroidal field (TF) ripple has been used as a tool in order to reveal the impact of the momentum pinch on the rotation profiles in H-mode JET discharges. The analysis showed that flatter rotation profiles were obtained in discharges with a high TF ripple, attributed to a smaller inward momentum convection. An average inward momentum pinch of approximately Vp ≈ 3.4 m s−1 and a normalized pinch value of RVp/χ ≈ 6.6 could explain the observation. The data show that the momentum at the edge affects the peaking of the rotation and momentum density profiles. Under the assumption that the heat and momentum diffusivities are equal, an estimate of the levels of the momentum pinch in all discharges in the JET rotation database was made. For H-mode discharge these ranged from 0.3 m s−1 < Vp < 17 m s−1, with 2 < RVp/χ < 10. A larger momentum pinch was found in discharges with a smaller density profile gradient length, i.e. a more peaked density profile.

    AB - In this study, enhancement of the toroidal field (TF) ripple has been used as a tool in order to reveal the impact of the momentum pinch on the rotation profiles in H-mode JET discharges. The analysis showed that flatter rotation profiles were obtained in discharges with a high TF ripple, attributed to a smaller inward momentum convection. An average inward momentum pinch of approximately Vp ≈ 3.4 m s−1 and a normalized pinch value of RVp/χ ≈ 6.6 could explain the observation. The data show that the momentum at the edge affects the peaking of the rotation and momentum density profiles. Under the assumption that the heat and momentum diffusivities are equal, an estimate of the levels of the momentum pinch in all discharges in the JET rotation database was made. For H-mode discharge these ranged from 0.3 m s−1 < Vp < 17 m s−1, with 2 < RVp/χ < 10. A larger momentum pinch was found in discharges with a smaller density profile gradient length, i.e. a more peaked density profile.

    U2 - 10.1088/0741-3335/52/6/065004

    DO - 10.1088/0741-3335/52/6/065004

    M3 - Article

    VL - 52

    JO - Plasma Physics and Controlled Fusion

    JF - Plasma Physics and Controlled Fusion

    SN - 0741-3335

    IS - 6

    M1 - 065004

    ER -