Main-ion intrinsic toroidal rotation profile driven by residual stress torque from ion temperature gradient turbulence in the DIII-D tokamak
- Princeton Univ., NJ (United States). Princeton Plasma Physics Lab.
- General Atomics, San Diego, CA (United States)
- 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
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