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Title: Main-ion intrinsic toroidal rotation profile driven by residual stress torque from ion temperature gradient turbulence in the DIII-D tokamak

Abstract

Intrinsic toroidal rotation of the deuterium main ions in the core of the DIII-D tokamak is observed to transition from flat to hollow, forming an off-axis peak, above a threshold level of direct electron heating. Nonlinear gyrokinetic simulations show that the residual stress associated with electrostatic ion temperature gradient turbulence possesses the correct radial location and stress structure to cause the observed hollow rotation profile. Residual stress momentum flux in the gyrokinetic simulations is balanced by turbulent momentum diffusion, with negligible contributions from turbulent pinch. Finally, the prediction of the velocity profile by integrating the momentum balance equation produces a rotation profile that qualitatively and quantitatively agrees with the measured main-ion profile, demonstrating that fluctuation-induced residual stress can drive the observed intrinsic velocity profile.

Authors:
 [1];  [1];  [1];  [2];  [1];  [3];  [2];  [2]
  1. Princeton Univ., NJ (United States). Princeton Plasma Physics Lab.
  2. General Atomics, San Diego, CA (United States)
  3. Univ. of California, San Diego, CA (United States). Center for Energy Research
Publication Date:
Research Org.:
Princeton Univ., NJ (United States); General Atomics, San Diego, CA (United States); Univ. of California, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24); USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1343410
Alternate Identifier(s):
OSTI ID: 1338653; OSTI ID: 1347148; OSTI ID: 1374809
Grant/Contract Number:  
AC02-09CH11466; FC02-04ER54698; FG02-07ER54917
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 118; Journal Issue: 1; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Grierson, B. A., Wang, W. X., Ethier, S., Staebler, G. M., Battaglia, D. J., Boedo, J. A., deGrassie, J. S., and Solomon, W. M. Main-ion intrinsic toroidal rotation profile driven by residual stress torque from ion temperature gradient turbulence in the DIII-D tokamak. United States: N. p., 2017. Web. doi:10.1103/PhysRevLett.118.015002.
Grierson, B. A., Wang, W. X., Ethier, S., Staebler, G. M., Battaglia, D. J., Boedo, J. A., deGrassie, J. S., & Solomon, W. M. Main-ion intrinsic toroidal rotation profile driven by residual stress torque from ion temperature gradient turbulence in the DIII-D tokamak. United States. doi:10.1103/PhysRevLett.118.015002.
Grierson, B. A., Wang, W. X., Ethier, S., Staebler, G. M., Battaglia, D. J., Boedo, J. A., deGrassie, J. S., and Solomon, W. M. Fri . "Main-ion intrinsic toroidal rotation profile driven by residual stress torque from ion temperature gradient turbulence in the DIII-D tokamak". United States. doi:10.1103/PhysRevLett.118.015002. https://www.osti.gov/servlets/purl/1343410.
@article{osti_1343410,
title = {Main-ion intrinsic toroidal rotation profile driven by residual stress torque from ion temperature gradient turbulence in the DIII-D tokamak},
author = {Grierson, B. A. and Wang, W. X. and Ethier, S. and Staebler, G. M. and Battaglia, D. J. and Boedo, J. A. and deGrassie, J. S. and Solomon, W. M.},
abstractNote = {Intrinsic toroidal rotation of the deuterium main ions in the core of the DIII-D tokamak is observed to transition from flat to hollow, forming an off-axis peak, above a threshold level of direct electron heating. Nonlinear gyrokinetic simulations show that the residual stress associated with electrostatic ion temperature gradient turbulence possesses the correct radial location and stress structure to cause the observed hollow rotation profile. Residual stress momentum flux in the gyrokinetic simulations is balanced by turbulent momentum diffusion, with negligible contributions from turbulent pinch. Finally, the prediction of the velocity profile by integrating the momentum balance equation produces a rotation profile that qualitatively and quantitatively agrees with the measured main-ion profile, demonstrating that fluctuation-induced residual stress can drive the observed intrinsic velocity profile.},
doi = {10.1103/PhysRevLett.118.015002},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 1,
volume = 118,
place = {United States},
year = {2017},
month = {1}
}

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