Toroidal rotation braking with n = 1 magnetic perturbation field on JET

JET-EFDA collaborators

    Research output: Contribution to journalArticleScientificpeer-review

    56 Citations (Scopus)

    Abstract

    A strong toroidal rotation braking has been observed in plasmas with application of an n = 1 magnetic perturbation field on the JET tokamak. Calculation results from the momentum transport analysis show that the torque induced by the n = 1 perturbation field has a global profile. The maximal value of this torque is at the plasma core region (ρ < 0.4) and it is about half of the neutral beam injection torque. The calculation shows that the plasma is mainly in the ν-√ν regime in the plasma core, but it is close to the transition between the 1/ν and ν-√ν regimes. The neoclassical toroidal viscosity (NTV) torque in the 1/ν and ν-√ν regimes is calculated. The observed torque is of a magnitude in between that of the NTV torque in the 1/ν and ν-√ν regimes. The NTV torque in the ν-√ν regimes is enhanced using the Lagrangian variation of the magnetic field strength. However, it is still smaller than the observed torque by one order of magnitude.
    Original languageEnglish
    Article number105007
    Number of pages19
    JournalPlasma Physics and Controlled Fusion
    Volume52
    Issue number10
    DOIs
    Publication statusPublished - 2010
    MoE publication typeA1 Journal article-refereed

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    braking
    Braking
    torque
    Torque
    perturbation
    Plasmas
    Viscosity
    viscosity
    beam injection
    neutral beams
    field strength
    Momentum
    Magnetic fields
    momentum
    profiles
    magnetic fields

    Cite this

    @article{0e0db3aa51de43aeadfcc0521af59131,
    title = "Toroidal rotation braking with n = 1 magnetic perturbation field on JET",
    abstract = "A strong toroidal rotation braking has been observed in plasmas with application of an n = 1 magnetic perturbation field on the JET tokamak. Calculation results from the momentum transport analysis show that the torque induced by the n = 1 perturbation field has a global profile. The maximal value of this torque is at the plasma core region (ρ < 0.4) and it is about half of the neutral beam injection torque. The calculation shows that the plasma is mainly in the ν-√ν regime in the plasma core, but it is close to the transition between the 1/ν and ν-√ν regimes. The neoclassical toroidal viscosity (NTV) torque in the 1/ν and ν-√ν regimes is calculated. The observed torque is of a magnitude in between that of the NTV torque in the 1/ν and ν-√ν regimes. The NTV torque in the ν-√ν regimes is enhanced using the Lagrangian variation of the magnetic field strength. However, it is still smaller than the observed torque by one order of magnitude.",
    author = "Y. Sun and Y. Liang and H.R. Koslowski and S. Jachmich and A. Alfier and O. Asunta and G. Corrigan and C. Giroud and M.P. Gryanznevich and D. Harting and T. Hender and E. Nardon and V. Naulin and V. Parail and Tuomas Tala and C. Wiegmann and S. Wiesen and {JET-EFDA collaborators}",
    year = "2010",
    doi = "10.1088/0741-3335/52/10/105007",
    language = "English",
    volume = "52",
    journal = "Plasma Physics and Controlled Fusion",
    issn = "0741-3335",
    publisher = "Institute of Physics IOP",
    number = "10",

    }

    Toroidal rotation braking with n = 1 magnetic perturbation field on JET. / JET-EFDA collaborators.

    In: Plasma Physics and Controlled Fusion, Vol. 52, No. 10, 105007, 2010.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Toroidal rotation braking with n = 1 magnetic perturbation field on JET

    AU - Sun, Y.

    AU - Liang, Y.

    AU - Koslowski, H.R.

    AU - Jachmich, S.

    AU - Alfier, A.

    AU - Asunta, O.

    AU - Corrigan, G.

    AU - Giroud, C.

    AU - Gryanznevich, M.P.

    AU - Harting, D.

    AU - Hender, T.

    AU - Nardon, E.

    AU - Naulin, V.

    AU - Parail, V.

    AU - Tala, Tuomas

    AU - Wiegmann, C.

    AU - Wiesen, S.

    AU - JET-EFDA collaborators

    PY - 2010

    Y1 - 2010

    N2 - A strong toroidal rotation braking has been observed in plasmas with application of an n = 1 magnetic perturbation field on the JET tokamak. Calculation results from the momentum transport analysis show that the torque induced by the n = 1 perturbation field has a global profile. The maximal value of this torque is at the plasma core region (ρ < 0.4) and it is about half of the neutral beam injection torque. The calculation shows that the plasma is mainly in the ν-√ν regime in the plasma core, but it is close to the transition between the 1/ν and ν-√ν regimes. The neoclassical toroidal viscosity (NTV) torque in the 1/ν and ν-√ν regimes is calculated. The observed torque is of a magnitude in between that of the NTV torque in the 1/ν and ν-√ν regimes. The NTV torque in the ν-√ν regimes is enhanced using the Lagrangian variation of the magnetic field strength. However, it is still smaller than the observed torque by one order of magnitude.

    AB - A strong toroidal rotation braking has been observed in plasmas with application of an n = 1 magnetic perturbation field on the JET tokamak. Calculation results from the momentum transport analysis show that the torque induced by the n = 1 perturbation field has a global profile. The maximal value of this torque is at the plasma core region (ρ < 0.4) and it is about half of the neutral beam injection torque. The calculation shows that the plasma is mainly in the ν-√ν regime in the plasma core, but it is close to the transition between the 1/ν and ν-√ν regimes. The neoclassical toroidal viscosity (NTV) torque in the 1/ν and ν-√ν regimes is calculated. The observed torque is of a magnitude in between that of the NTV torque in the 1/ν and ν-√ν regimes. The NTV torque in the ν-√ν regimes is enhanced using the Lagrangian variation of the magnetic field strength. However, it is still smaller than the observed torque by one order of magnitude.

    U2 - 10.1088/0741-3335/52/10/105007

    DO - 10.1088/0741-3335/52/10/105007

    M3 - Article

    VL - 52

    JO - Plasma Physics and Controlled Fusion

    JF - Plasma Physics and Controlled Fusion

    SN - 0741-3335

    IS - 10

    M1 - 105007

    ER -