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

NameBulletin of the American Physical Society
PublisherAPS Physics
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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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.",
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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",
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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).