Characteristics of Turbulence-driven Plasma Flow and Origin of Experimental Empirical Scalings of Intrinsic Rotation

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Toroidal plasma flow driven by turbulent torque associated with nonlinear residual stress generation is shown to recover the observed key features of intrinsic rotation in experiments. Specifically, the turbulence-driven intrinsic rotation scales close to linearly with plasma gradients and the inverse of the plasma current, qualitatively reproducing empirical scalings obtained from a large experimental data base. The effect of magnetic shear on the symmetry breaking in the parallel wavenumber spectrum is identified. The origin of the current scaling is found to be the enhanced kll#3; symmetry breaking induced by increased radial variation of the safety factor as the current decreases. ... continued below

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W.X. Wang, T.S. Hahm, S. Ethier, G. Rewoldt, W.M. Tang, W.W. Lee and P.H. Diamond March 20, 2011.

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Toroidal plasma flow driven by turbulent torque associated with nonlinear residual stress generation is shown to recover the observed key features of intrinsic rotation in experiments. Specifically, the turbulence-driven intrinsic rotation scales close to linearly with plasma gradients and the inverse of the plasma current, qualitatively reproducing empirical scalings obtained from a large experimental data base. The effect of magnetic shear on the symmetry breaking in the parallel wavenumber spectrum is identified. The origin of the current scaling is found to be the enhanced kll#3; symmetry breaking induced by increased radial variation of the safety factor as the current decreases. The physics origin for the linear dependence of intrinsic rotation on the pressure gradient comes from the fact that both turbulence intensity and the zonal flow shear, which are two key ingredients for driving the residual stress, are increased with the strength of the turbulence drives, which are R/LTe and R/Lne for the collisionless trapped electron mode (CTEM). Highlighted results also include robust radial pinches in toroidal flow, heat and particle transport driven by CTEM turbulence, which emerge "in phase", and are shown to play important roles in determining plasma profiles. Also discussed are experimental tests proposed to validate findings from these gyrokinetic simulations.

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  • Physics of Plasmas (2011)

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  • Report No.: PPPL-44608
  • Grant Number: DE-ACO2-09CH111466
  • Office of Scientific & Technical Information Report Number: 1010968
  • Archival Resource Key: ark:/67531/metadc847005

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  • March 20, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Aug. 3, 2016, 6:50 p.m.

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W.X. Wang, T.S. Hahm, S. Ethier, G. Rewoldt, W.M. Tang, W.W. Lee and P.H. Diamond. Characteristics of Turbulence-driven Plasma Flow and Origin of Experimental Empirical Scalings of Intrinsic Rotation, report, March 20, 2011; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc847005/: accessed May 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.