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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

Journal Article · · Physical Review Letters
 [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

Intrinsic toroidal rotation of the deuterium main-ions in the core of the DIII-D tokamak is observed to transition from at 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 ITG 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. 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.

Research Organization:
Princeton Univ., NJ (United States); General Atomics, San Diego, CA (United States); Univ. of California, San Diego, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Nuclear Energy (NE)
Grant/Contract Number:
AC02-09CH11466; FC02-04ER54698; FG02-07ER54917
OSTI ID:
1343410
Alternate ID(s):
OSTI ID: 1338653; OSTI ID: 1347148; OSTI ID: 1374809
Journal Information:
Physical Review Letters, Vol. 118, Issue 1; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 24 works
Citation information provided by
Web of Science

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Cited By (12)

Symmetry breaking induced by the parity change in global electromagnetic ion temperature gradient modes journal January 2018
Active spectroscopy measurements of the deuterium temperature, rotation, and density from the core to scrape off layer on the DIII-D tokamak (invited) journal October 2018
Main-ion intrinsic toroidal rotation across the ITG/TEM boundary in DIII-D discharges during ohmic and electron cyclotron heating journal April 2019
Main-ion temperature and plasma rotation measurements based on scattering of electron cyclotron heating waves in ASDEX Upgrade journal June 2017
Intrinsic rotation driven by turbulent acceleration journal November 2018
Intrinsic rotation in axisymmetric devices journal November 2019
Dynamics of the pedestal transport during edge localized mode cycles at ASDEX Upgrade journal January 2020
Global gyrokinetic simulations of intrinsic rotation in ASDEX Upgrade Ohmic L-mode plasmas journal March 2018
Studies of Reynolds stress and the turbulent generation of edge poloidal flows on the HL-2A tokamak journal August 2019
Observations of toroidal plasma rotation reversal in the Aditya-U tokamak journal September 2019
Hysteresis as a probe of turbulent bifurcation in intrinsic rotation reversals on Alcator C-Mod journal August 2019
Observation and characterization of the effect of electron cyclotron waves on toroidal rotation in EAST L-mode discharges journal August 2017

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