Predicting rotation for ITER via studies of intrinsic torque and momentum transport in DIII-D

C. Chrystal, B. Grierson, G. Staebler, C. Petty, W. Solomon, J. deGrassie, K. Burrell, T. Tala, A. Salmi

Research output: Contribution to journalArticleScientificpeer-review

14 Citations (Scopus)

Abstract

Experiments at the DIII-D tokamak have used dimensionless parameter scans to investigate the dependencies of intrinsic torque and momentum transport in order to inform a prediction of the rotation profile in ITER. Measurements of intrinsic torque profiles and momentum confinement time in dimensionless parameter scans of normalized gyroradius and collisionality are used to predict the amount of intrinsic rotation in the pedestal of ITER. Additional scans of Te/Ti and safety factor are used to determine the accuracy of momentum flux predictions of the quasi-linear gyrokinetic code TGLF. In these scans, applications of modulated torque are used to measure the incremental momentum diffusivity, and results are consistent with the E×B shear suppression of turbulent transport. These incremental transport measurements are also compared with the TGLF results. In order to form a prediction of the rotation profile for ITER, the pedestal prediction is used as a boundary condition to a simulation that uses TGLF to determine the transport in the core of the plasma. The predicted rotation is ≈20 krad/s in the core, lower than in many current tokamak operating scenarios. TGLF predictions show that this rotation is still significant enough to have a strong effect on confinement via E×B shear.

Original languageEnglish
Article number056113
JournalPhysics of Plasmas
Volume24
Issue number5
DOIs
Publication statusPublished - 1 May 2017
MoE publication typeA1 Journal article-refereed

Fingerprint

torque
momentum
predictions
profiles
shear
safety factors
diffusivity
retarding
boundary conditions
simulation

Keywords

  • forecasting
  • magnetoplasma
  • momentum
  • momentum transfer
  • rotation
  • safety factor
  • shear flow
  • torque
  • dimensionless parameters
  • gyrokinetic codes
  • momentum confinement
  • momentum diffusivity
  • momentum transports
  • shear suppression
  • transport measurements
  • turbulent transports

Cite this

Chrystal, C., Grierson, B., Staebler, G., Petty, C., Solomon, W., deGrassie, J., ... Salmi, A. (2017). Predicting rotation for ITER via studies of intrinsic torque and momentum transport in DIII-D. Physics of Plasmas, 24(5), [056113]. https://doi.org/10.1063/1.4979194
Chrystal, C. ; Grierson, B. ; Staebler, G. ; Petty, C. ; Solomon, W. ; deGrassie, J. ; Burrell, K. ; Tala, T. ; Salmi, A. / Predicting rotation for ITER via studies of intrinsic torque and momentum transport in DIII-D. In: Physics of Plasmas. 2017 ; Vol. 24, No. 5.
@article{205ce266d74143ab81bcc50923422c56,
title = "Predicting rotation for ITER via studies of intrinsic torque and momentum transport in DIII-D",
abstract = "Experiments at the DIII-D tokamak have used dimensionless parameter scans to investigate the dependencies of intrinsic torque and momentum transport in order to inform a prediction of the rotation profile in ITER. Measurements of intrinsic torque profiles and momentum confinement time in dimensionless parameter scans of normalized gyroradius and collisionality are used to predict the amount of intrinsic rotation in the pedestal of ITER. Additional scans of Te/Ti and safety factor are used to determine the accuracy of momentum flux predictions of the quasi-linear gyrokinetic code TGLF. In these scans, applications of modulated torque are used to measure the incremental momentum diffusivity, and results are consistent with the E×B shear suppression of turbulent transport. These incremental transport measurements are also compared with the TGLF results. In order to form a prediction of the rotation profile for ITER, the pedestal prediction is used as a boundary condition to a simulation that uses TGLF to determine the transport in the core of the plasma. The predicted rotation is ≈20 krad/s in the core, lower than in many current tokamak operating scenarios. TGLF predictions show that this rotation is still significant enough to have a strong effect on confinement via E×B shear.",
keywords = "forecasting, magnetoplasma, momentum, momentum transfer, rotation, safety factor, shear flow, torque, dimensionless parameters, gyrokinetic codes, momentum confinement, momentum diffusivity, momentum transports, shear suppression, transport measurements, turbulent transports",
author = "C. Chrystal and B. Grierson and G. Staebler and C. Petty and W. Solomon and J. deGrassie and K. Burrell and T. Tala and A. Salmi",
year = "2017",
month = "5",
day = "1",
doi = "10.1063/1.4979194",
language = "English",
volume = "24",
journal = "Physics of Plasmas",
issn = "1527-2419",
publisher = "American Institute of Physics AIP",
number = "5",

}

Chrystal, C, Grierson, B, Staebler, G, Petty, C, Solomon, W, deGrassie, J, Burrell, K, Tala, T & Salmi, A 2017, 'Predicting rotation for ITER via studies of intrinsic torque and momentum transport in DIII-D', Physics of Plasmas, vol. 24, no. 5, 056113. https://doi.org/10.1063/1.4979194

Predicting rotation for ITER via studies of intrinsic torque and momentum transport in DIII-D. / Chrystal, C.; Grierson, B.; Staebler, G.; Petty, C.; Solomon, W.; deGrassie, J.; Burrell, K.; Tala, T.; Salmi, A.

In: Physics of Plasmas, Vol. 24, No. 5, 056113, 01.05.2017.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Predicting rotation for ITER via studies of intrinsic torque and momentum transport in DIII-D

AU - Chrystal, C.

AU - Grierson, B.

AU - Staebler, G.

AU - Petty, C.

AU - Solomon, W.

AU - deGrassie, J.

AU - Burrell, K.

AU - Tala, T.

AU - Salmi, A.

PY - 2017/5/1

Y1 - 2017/5/1

N2 - Experiments at the DIII-D tokamak have used dimensionless parameter scans to investigate the dependencies of intrinsic torque and momentum transport in order to inform a prediction of the rotation profile in ITER. Measurements of intrinsic torque profiles and momentum confinement time in dimensionless parameter scans of normalized gyroradius and collisionality are used to predict the amount of intrinsic rotation in the pedestal of ITER. Additional scans of Te/Ti and safety factor are used to determine the accuracy of momentum flux predictions of the quasi-linear gyrokinetic code TGLF. In these scans, applications of modulated torque are used to measure the incremental momentum diffusivity, and results are consistent with the E×B shear suppression of turbulent transport. These incremental transport measurements are also compared with the TGLF results. In order to form a prediction of the rotation profile for ITER, the pedestal prediction is used as a boundary condition to a simulation that uses TGLF to determine the transport in the core of the plasma. The predicted rotation is ≈20 krad/s in the core, lower than in many current tokamak operating scenarios. TGLF predictions show that this rotation is still significant enough to have a strong effect on confinement via E×B shear.

AB - Experiments at the DIII-D tokamak have used dimensionless parameter scans to investigate the dependencies of intrinsic torque and momentum transport in order to inform a prediction of the rotation profile in ITER. Measurements of intrinsic torque profiles and momentum confinement time in dimensionless parameter scans of normalized gyroradius and collisionality are used to predict the amount of intrinsic rotation in the pedestal of ITER. Additional scans of Te/Ti and safety factor are used to determine the accuracy of momentum flux predictions of the quasi-linear gyrokinetic code TGLF. In these scans, applications of modulated torque are used to measure the incremental momentum diffusivity, and results are consistent with the E×B shear suppression of turbulent transport. These incremental transport measurements are also compared with the TGLF results. In order to form a prediction of the rotation profile for ITER, the pedestal prediction is used as a boundary condition to a simulation that uses TGLF to determine the transport in the core of the plasma. The predicted rotation is ≈20 krad/s in the core, lower than in many current tokamak operating scenarios. TGLF predictions show that this rotation is still significant enough to have a strong effect on confinement via E×B shear.

KW - forecasting

KW - magnetoplasma

KW - momentum

KW - momentum transfer

KW - rotation

KW - safety factor

KW - shear flow

KW - torque

KW - dimensionless parameters

KW - gyrokinetic codes

KW - momentum confinement

KW - momentum diffusivity

KW - momentum transports

KW - shear suppression

KW - transport measurements

KW - turbulent transports

UR - http://www.scopus.com/inward/record.url?scp=85016638217&partnerID=8YFLogxK

U2 - 10.1063/1.4979194

DO - 10.1063/1.4979194

M3 - Article

VL - 24

JO - Physics of Plasmas

JF - Physics of Plasmas

SN - 1527-2419

IS - 5

M1 - 056113

ER -

Chrystal C, Grierson B, Staebler G, Petty C, Solomon W, deGrassie J et al. Predicting rotation for ITER via studies of intrinsic torque and momentum transport in DIII-D. Physics of Plasmas. 2017 May 1;24(5). 056113. https://doi.org/10.1063/1.4979194