Simulation of ion-temperature-gradient turbulence in tokamaks

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Results are presented from nonlinear gyrokinetic simulations of toroidal ion temperature gradient (ITG) turbulence and transport. The gyrokinetic simulations are found to yield values of the thermal diffusivity significantly lower than gyrofluid or IFS-PPPL-model predictions. A new phenomenon of nonlinear effective critical gradients larger than the linear instability threshold gradients is observed, and is associated with undamped flux-surface-averaged shear flows. The nonlinear gyrokineic codes have passed extensive validity tests which include comparison against independent linear calculations, a series of nonlinear convergence tests, and a comparison between two independent nonlinear gyrokinetic codes. Our most realistic simulations to date have actual reconstructed ... continued below

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Cohen, B I; Dimits, A M; Kim, C; Mattor, N; Nevins, W M; Parker, S E et al. October 14, 1998.

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Results are presented from nonlinear gyrokinetic simulations of toroidal ion temperature gradient (ITG) turbulence and transport. The gyrokinetic simulations are found to yield values of the thermal diffusivity significantly lower than gyrofluid or IFS-PPPL-model predictions. A new phenomenon of nonlinear effective critical gradients larger than the linear instability threshold gradients is observed, and is associated with undamped flux-surface-averaged shear flows. The nonlinear gyrokineic codes have passed extensive validity tests which include comparison against independent linear calculations, a series of nonlinear convergence tests, and a comparison between two independent nonlinear gyrokinetic codes. Our most realistic simulations to date have actual reconstructed equilibria from experiments and a model for dilution by impurity and beam ions. These simulations highlight the need for still more physics to be included in the simulations

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  • 17th International Atomic Energy Agency Fusion Energy Conference, Yokohama, Japan, October 19-24, 1998

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  • Other: DE00003934
  • Report No.: UCRL-JC-130166
  • Grant Number: W-7405-Eng-48
  • Office of Scientific & Technical Information Report Number: 3934
  • Archival Resource Key: ark:/67531/metadc676518

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  • October 14, 1998

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 24, 2016, 4:08 p.m.

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Cohen, B I; Dimits, A M; Kim, C; Mattor, N; Nevins, W M; Parker, S E et al. Simulation of ion-temperature-gradient turbulence in tokamaks, article, October 14, 1998; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc676518/: accessed August 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.