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

Abstract

Here, 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 x 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 onmore » confinement via E x B shear.« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [1];  [3];  [3]
  1. General Atomics, San Diego, CA (United States)
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. VTT Technical Research Centre of Finland, Espoo (Finland)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1373694
Alternate Identifier(s):
OSTI ID: 1373963; OSTI ID: 1374851
Grant/Contract Number:  
633053; AC02-09CH11466; FC02-04ER54698
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 5; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Chrystal, C., Grierson, B. A., Staebler, G. M., Petty, C. C., Solomon, W. M., deGrassie, J. S., Burrell, K. H., Tala, T., and Salmi, A. Predicting rotation for ITER via studies of intrinsic torque and momentum transport in DIII-D. United States: N. p., 2017. Web. doi:10.1063/1.4979194.
Chrystal, C., Grierson, B. A., Staebler, G. M., Petty, C. C., Solomon, W. M., deGrassie, J. S., Burrell, K. H., Tala, T., & Salmi, A. Predicting rotation for ITER via studies of intrinsic torque and momentum transport in DIII-D. United States. doi:10.1063/1.4979194.
Chrystal, C., Grierson, B. A., Staebler, G. M., Petty, C. C., Solomon, W. M., deGrassie, J. S., Burrell, K. H., Tala, T., and Salmi, A. Thu . "Predicting rotation for ITER via studies of intrinsic torque and momentum transport in DIII-D". United States. doi:10.1063/1.4979194. https://www.osti.gov/servlets/purl/1373694.
@article{osti_1373694,
title = {Predicting rotation for ITER via studies of intrinsic torque and momentum transport in DIII-D},
author = {Chrystal, C. and Grierson, B. A. and Staebler, G. M. and Petty, C. C. and Solomon, W. M. and deGrassie, J. S. and Burrell, K. H. and Tala, T. and Salmi, A.},
abstractNote = {Here, 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 x 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 x B shear.},
doi = {10.1063/1.4979194},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 24,
place = {United States},
year = {2017},
month = {3}
}

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