Trapped Electron Mode Turbulence Driven Intrinsic Rotation in Tokamak Plasmas

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Recent progress from global gyrokinetic simulations in understanding the origin of intrinsic rotation in toroidal plasmas is reported with emphasis on electron thermal transport dominated regimes. The turbulence driven intrinsic torque associated with nonlinear residual stress generation by the fluctuation intensity and the intensity gradient in the presence of zonal flow shear induced asymmetry in the parallel wavenumber spectrum is shown to scale close to linearly with plasma gradients and the inverse of the plasma current. These results qualitatively reproduce empirical scalings of intrinsic rotation observed in various experiments. The origin of current scaling is found to be due to ... continued below

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W. X. Wang, T. S. Hahm, S. Ethier, and L.E. Zakharov February 7, 2011.

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Recent progress from global gyrokinetic simulations in understanding the origin of intrinsic rotation in toroidal plasmas is reported with emphasis on electron thermal transport dominated regimes. The turbulence driven intrinsic torque associated with nonlinear residual stress generation by the fluctuation intensity and the intensity gradient in the presence of zonal flow shear induced asymmetry in the parallel wavenumber spectrum is shown to scale close to linearly with plasma gradients and the inverse of the plasma current. These results qualitatively reproduce empirical scalings of intrinsic rotation observed in various experiments. The origin of current scaling is found to be due to enhanced kll symmetry breaking induced by the increased radial variation of the safety factor as the current decreases. The physics origin for the linear dependence of intrinsic torque on pressure gradient is that both turbulence intensity and the zonal flow shear, which are two key ingredients for driving residual stress, increase with the strength of turbulence drive, which is R0/LTe and R0/Lne for the trapped electron mode. __________________________________________________

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  • Physical Review Letters

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  • Report No.: PPPL-4599
  • Grant Number: DE-ACO2-09CHO11466
  • Office of Scientific & Technical Information Report Number: 1007180
  • Archival Resource Key: ark:/67531/metadc833856

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  • February 7, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Aug. 3, 2016, 6:07 p.m.

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W. X. Wang, T. S. Hahm, S. Ethier, and L.E. Zakharov. Trapped Electron Mode Turbulence Driven Intrinsic Rotation in Tokamak Plasmas, report, February 7, 2011; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc833856/: accessed November 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.