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Title: Toroidal momentum transport in a tokamak due to profile shearing

The effect of profile shearing on toroidal momentum transport is studied in linear and non-linear gyro-kinetic simulations. Retaining the radial dependence of both plasma and geometry parameters leads to a momentum flux that has contributions both linear in the logarithmic gradients of density and temperature, as well as contributions linear in the derivatives of the logarithmic gradients. The effect of the turbulence intensity gradient on momentum transport is found to be small for the studied parameters. Linear simulations at fixed normalized toroidal wave number predict a weak dependence of the momentum flux on the normalized Larmor radius ρ{sub *}=ρ/R. Non-linear simulations, however, at sufficiently small ρ{sub *} show a linear scaling of the momentum flux with ρ{sub *}. The obtained stationary rotation gradients are in the range of, although perhaps smaller than, current experiments. For a reactor plasma, however, a rather small rotation gradient should result from profile shearing.
Authors:
; ; ; ;  [1] ;  [2] ;  [3]
  1. Physics Department, University of Bayreuth, Universitätsstrasse 30 Bayreuth (Germany)
  2. Aix-Marseille Université, CNRS, PIIM UMR 7345, Marseille 13397 (France)
  3. EURATOM Association, Max Planck Institut fuer Plasmaphysik, Boltzmannstrasse 2, Garching 85748 (Germany)
Publication Date:
OSTI Identifier:
22304179
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 6; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CURRENTS; GEOMETRY; LARMOR RADIUS; NONLINEAR PROBLEMS; PLASMA; SHEAR; SIMULATION; TOKAMAK DEVICES; TURBULENCE