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
    PublisherAmerican Physical Society
    Publication statusPublished - 2017
    MoE publication typeNot Eligible
    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

    Keywords

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

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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] American Physical Society. Bulletin of the American Physical Society, No. 12, Vol.. 62 http://meetings.aps.org/link/BAPS.2017.DPP.BO4.7