skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Trapped Electron Mode Turbulence Driven Intrinsic Rotation in Tokamak Plasmas

Abstract

Progress from global gyrokinetic simulations in understanding the origin of intrinsic rotation in toroidal plasmas is reported. The turbulence-driven intrinsic torque associated with nonlinear residual stress generation due to zonal flow shear induced asymmetry in the parallel wave number spectrum is shown to scale close to linearly with plasma gradients and the inverse of the plasma current, qualitatively reproducing experimental empirical scalings of intrinsic rotation. The origin of current scaling is found to be enhanced k{sub ||} symmetry breaking induced by the increased radial variation of the safety factor as the current decreases. The intrinsic torque is proportional to the pressure gradient because both turbulence intensity and zonal flow shear, which are two key ingredients for driving residual stress, increase with turbulence drive, which is R/L{sub T{sub e}} and R/L{sub n{sub e}} for the trapped electron mode.

Authors:
; ; ; ;  [1]
  1. Plasma Physics Laboratory, Princeton University, P.O. Box 451, Princeton, New Jersey 08543 (United States); University of California, San Diego, La Jolla, California 92093 (United States)
Publication Date:
OSTI Identifier:
21562064
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 106; Journal Issue: 8; Other Information: DOI: 10.1103/PhysRevLett.106.085001; (c) 2011 American Institute of Physics; Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ASYMMETRY; ELECTRIC CURRENTS; NONLINEAR PROBLEMS; PLASMA; PRESSURE GRADIENTS; RESIDUAL STRESSES; ROTATION; SCALING; SHEAR; SIMULATION; SPECTRA; SYMMETRY BREAKING; TOKAMAK DEVICES; TORQUE; TRAPPED ELECTRONS; TURBULENCE; CLOSED PLASMA DEVICES; CURRENTS; ELECTRONS; ELEMENTARY PARTICLES; FERMIONS; LEPTONS; MOTION; STRESSES; THERMONUCLEAR DEVICES

Citation Formats

Wang, W X, Hahm, T S, Ethier, S, Zakharov, L E, and Diamond, P H. Trapped Electron Mode Turbulence Driven Intrinsic Rotation in Tokamak Plasmas. United States: N. p., 2011. Web. doi:10.1103/PHYSREVLETT.106.085001.
Wang, W X, Hahm, T S, Ethier, S, Zakharov, L E, & Diamond, P H. Trapped Electron Mode Turbulence Driven Intrinsic Rotation in Tokamak Plasmas. United States. doi:10.1103/PHYSREVLETT.106.085001.
Wang, W X, Hahm, T S, Ethier, S, Zakharov, L E, and Diamond, P H. Fri . "Trapped Electron Mode Turbulence Driven Intrinsic Rotation in Tokamak Plasmas". United States. doi:10.1103/PHYSREVLETT.106.085001.
@article{osti_21562064,
title = {Trapped Electron Mode Turbulence Driven Intrinsic Rotation in Tokamak Plasmas},
author = {Wang, W X and Hahm, T S and Ethier, S and Zakharov, L E and Diamond, P H},
abstractNote = {Progress from global gyrokinetic simulations in understanding the origin of intrinsic rotation in toroidal plasmas is reported. The turbulence-driven intrinsic torque associated with nonlinear residual stress generation due to zonal flow shear induced asymmetry in the parallel wave number spectrum is shown to scale close to linearly with plasma gradients and the inverse of the plasma current, qualitatively reproducing experimental empirical scalings of intrinsic rotation. The origin of current scaling is found to be enhanced k{sub ||} symmetry breaking induced by the increased radial variation of the safety factor as the current decreases. The intrinsic torque is proportional to the pressure gradient because both turbulence intensity and zonal flow shear, which are two key ingredients for driving residual stress, increase with turbulence drive, which is R/L{sub T{sub e}} and R/L{sub n{sub e}} for the trapped electron mode.},
doi = {10.1103/PHYSREVLETT.106.085001},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 8,
volume = 106,
place = {United States},
year = {2011},
month = {2}
}