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; Tuomas Tala; Antti Salmi

doi:10.1063/1.4979194

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, Tuomas Tala, Antti Salmi

Research output: Contribution to journal › Article › Scientific › peer-review

34 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 T_e/T_i 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 language	English
Article number	056113
Journal	Physics of Plasmas
Volume	24
Issue number	5
DOIs	https://doi.org/10.1063/1.4979194
Publication status	Published - 1 May 2017
MoE publication type	A1 Journal article-refereed

Funding

This material was based upon the work supported by the U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences, using the DIII-D National Fusion Facility, a DOE Office of Science user facility, under Award Nos. DE-FC02-04ER54698 and DE-AC02-09CH11466. A portion of this work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 under Grant Agreement No. 633053. A portion of this work was conducted under the auspices of the ITPA Transport and Confinement Topical Group.

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

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1063/1.4979194

Cite this

@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 Tuomas Tala and Antti Salmi",

year = "2017",

month = may,

day = "1",

doi = "10.1063/1.4979194",

language = "English",

volume = "24",

journal = "Physics of Plasmas",

issn = "1070-664X",

publisher = "American Institute of Physics (AIP)",

number = "5",

}

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, Tuomas

AU - Salmi, Antti

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

SN - 1070-664X

VL - 24

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 5

M1 - 056113

ER -

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

Abstract

Funding

Keywords

UN SDGs

Access to Document

Other files and links

Fingerprint

Cite this