Advances in understanding and control of plasma rotation on DIII-D

B. Grierson, N. Logan, S. Haskey, A. Ashourvan, D. Ernst, C. Chrystal, J. Degrassie, J. Boedo, T. Tala, A. Salmi

    Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

    Abstract

    Momentum transport experiments on DIII-D have advanced our understanding of the origin of core and edge rotation by showing that (1) core rotation in low-torque electron-heated ITER-like plasmas displays hollowing driven by turbulence in the absence of MHD, (2) intrinsic rotation in torque-free electron-heated plasmas follows the favorable rho* and nu* scalings as previously found in intrinsic torque experiments using NBI, (3) the edge plasma rotation can be controlled through shaping of triangularity and X-point radius, and (4) rotation and density profiles have separate dependencies on the applied 3D field spectra. These advances inform strategies to avoid low torque disruptions by tailoring turbulent modes that minimize rotation hollowing, and provide confidence in dimensionless scaling of intrinsic torque and rotation to ITER. The triangularity and X-point position provide important new actuators on the rotation beyond neutral beam injection that are available for any diverted tokamak including ITER. The separate spectral dependencies of the momentum and density explain how quiescent braking as well as edge isolated ELM control are possible even in machines with limited toroidal harmonic EFC coils.
    Original languageEnglish
    Title of host publication59th Annual Meeting of the APS Division of Plasma Physics
    Publication statusPublished - 2017
    Event59th Annual Meeting of the APS Division of Plasma Physics - Milwaukee, United States
    Duration: 23 Oct 201727 Oct 2017

    Publication series

    SeriesBulletin of the American Physical Society
    Number12
    Volume62

    Conference

    Conference59th Annual Meeting of the APS Division of Plasma Physics
    CountryUnited States
    CityMilwaukee
    Period23/10/1727/10/17

    Fingerprint

    torque
    momentum
    scaling
    braking
    beam injection
    neutral beams
    electron plasma
    free electrons
    confidence
    coils
    actuators
    turbulence
    harmonics
    radii
    profiles
    electrons

    Keywords

    • DIII-D
    • fusion
    • tokamak
    • energy
    • plasma
    • transport
    • momentum transport

    Cite this

    Grierson, B., Logan, N., Haskey, S., Ashourvan, A., Ernst, D., Chrystal, C., ... Salmi, A. (2017). Advances in understanding and control of plasma rotation on DIII-D. In 59th Annual Meeting of the APS Division of Plasma Physics [BAPS.2017.DPP.BO4.7] Bulletin of the American Physical Society, No. 12, Vol.. 62
    Grierson, B. ; Logan, N. ; Haskey, S. ; Ashourvan, A. ; Ernst, D. ; Chrystal, C. ; Degrassie, J. ; Boedo, J. ; Tala, T. ; Salmi, A. / Advances in understanding and control of plasma rotation on DIII-D. 59th Annual Meeting of the APS Division of Plasma Physics. 2017. (Bulletin of the American Physical Society; No. 12, Vol. 62).
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    title = "Advances in understanding and control of plasma rotation on DIII-D",
    abstract = "Momentum transport experiments on DIII-D have advanced our understanding of the origin of core and edge rotation by showing that (1) core rotation in low-torque electron-heated ITER-like plasmas displays hollowing driven by turbulence in the absence of MHD, (2) intrinsic rotation in torque-free electron-heated plasmas follows the favorable rho* and nu* scalings as previously found in intrinsic torque experiments using NBI, (3) the edge plasma rotation can be controlled through shaping of triangularity and X-point radius, and (4) rotation and density profiles have separate dependencies on the applied 3D field spectra. These advances inform strategies to avoid low torque disruptions by tailoring turbulent modes that minimize rotation hollowing, and provide confidence in dimensionless scaling of intrinsic torque and rotation to ITER. The triangularity and X-point position provide important new actuators on the rotation beyond neutral beam injection that are available for any diverted tokamak including ITER. The separate spectral dependencies of the momentum and density explain how quiescent braking as well as edge isolated ELM control are possible even in machines with limited toroidal harmonic EFC coils.",
    keywords = "DIII-D, fusion, tokamak, energy, plasma, transport, momentum transport",
    author = "B. Grierson and N. Logan and S. Haskey and A. Ashourvan and D. Ernst and C. Chrystal and J. Degrassie and J. Boedo and T. Tala and A. Salmi",
    note = "Abstract #BO4.007",
    year = "2017",
    language = "English",
    series = "Bulletin of the American Physical Society",
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    Grierson, B, Logan, N, Haskey, S, Ashourvan, A, Ernst, D, Chrystal, C, Degrassie, J, Boedo, J, Tala, T & Salmi, A 2017, Advances in understanding and control of plasma rotation on DIII-D. in 59th Annual Meeting of the APS Division of Plasma Physics., BAPS.2017.DPP.BO4.7, Bulletin of the American Physical Society, no. 12, vol. 62, 59th Annual Meeting of the APS Division of Plasma Physics, Milwaukee, United States, 23/10/17.

    Advances in understanding and control of plasma rotation on DIII-D. / Grierson, B.; Logan, N.; Haskey, S.; Ashourvan, A.; Ernst, D.; Chrystal, C.; Degrassie, J.; Boedo, J.; Tala, T.; Salmi, A.

    59th Annual Meeting of the APS Division of Plasma Physics. 2017. BAPS.2017.DPP.BO4.7 (Bulletin of the American Physical Society; No. 12, Vol. 62).

    Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

    TY - CHAP

    T1 - Advances in understanding and control of plasma rotation on DIII-D

    AU - Grierson, B.

    AU - Logan, N.

    AU - Haskey, S.

    AU - Ashourvan, A.

    AU - Ernst, D.

    AU - Chrystal, C.

    AU - Degrassie, J.

    AU - Boedo, J.

    AU - Tala, T.

    AU - Salmi, A.

    N1 - Abstract #BO4.007

    PY - 2017

    Y1 - 2017

    N2 - Momentum transport experiments on DIII-D have advanced our understanding of the origin of core and edge rotation by showing that (1) core rotation in low-torque electron-heated ITER-like plasmas displays hollowing driven by turbulence in the absence of MHD, (2) intrinsic rotation in torque-free electron-heated plasmas follows the favorable rho* and nu* scalings as previously found in intrinsic torque experiments using NBI, (3) the edge plasma rotation can be controlled through shaping of triangularity and X-point radius, and (4) rotation and density profiles have separate dependencies on the applied 3D field spectra. These advances inform strategies to avoid low torque disruptions by tailoring turbulent modes that minimize rotation hollowing, and provide confidence in dimensionless scaling of intrinsic torque and rotation to ITER. The triangularity and X-point position provide important new actuators on the rotation beyond neutral beam injection that are available for any diverted tokamak including ITER. The separate spectral dependencies of the momentum and density explain how quiescent braking as well as edge isolated ELM control are possible even in machines with limited toroidal harmonic EFC coils.

    AB - Momentum transport experiments on DIII-D have advanced our understanding of the origin of core and edge rotation by showing that (1) core rotation in low-torque electron-heated ITER-like plasmas displays hollowing driven by turbulence in the absence of MHD, (2) intrinsic rotation in torque-free electron-heated plasmas follows the favorable rho* and nu* scalings as previously found in intrinsic torque experiments using NBI, (3) the edge plasma rotation can be controlled through shaping of triangularity and X-point radius, and (4) rotation and density profiles have separate dependencies on the applied 3D field spectra. These advances inform strategies to avoid low torque disruptions by tailoring turbulent modes that minimize rotation hollowing, and provide confidence in dimensionless scaling of intrinsic torque and rotation to ITER. The triangularity and X-point position provide important new actuators on the rotation beyond neutral beam injection that are available for any diverted tokamak including ITER. The separate spectral dependencies of the momentum and density explain how quiescent braking as well as edge isolated ELM control are possible even in machines with limited toroidal harmonic EFC coils.

    KW - DIII-D

    KW - fusion

    KW - tokamak

    KW - energy

    KW - plasma

    KW - transport

    KW - momentum transport

    M3 - Conference abstract in proceedings

    T3 - Bulletin of the American Physical Society

    BT - 59th Annual Meeting of the APS Division of Plasma Physics

    ER -

    Grierson B, Logan N, Haskey S, Ashourvan A, Ernst D, Chrystal C et al. Advances in understanding and control of plasma rotation on DIII-D. In 59th Annual Meeting of the APS Division of Plasma Physics. 2017. BAPS.2017.DPP.BO4.7. (Bulletin of the American Physical Society; No. 12, Vol. 62).