2004
DOI: 10.1063/1.1705653
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Role of trapped electron mode turbulence in internal transport barrier control in the Alcator C-Mod Tokamak

Abstract: Nonlinear gyrokinetic simulations of trapped electron mode (TEM) turbulence, within an internal particle transport barrier, are performed and compared with experimental data. The results provide a mechanism for transport barrier control with on-axis radio frequency heating, as demonstrated in Alcator C-Mod experiments [S. J. Wukitch et al., Phys. Plasmas 9(5) 2149 (2002)]. Off-axis heating produces an internal particle and energy transport barrier after the transition to enhanced Dα high confinement mode. The … Show more

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Cited by 154 publications
(162 citation statements)
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“…We also used comparisons with the analytical results from both theories to verify and demonstrate the accuracy of the gyrokinetic simulation code GS2 in the parameter regimes of astrophysical interest. We note that although our tests are linear, GS2 has already been used extensively for nonlinear turbulence problems in the fusion research (e.g., Dorland et al 2000;Jenko et al 2000Rogers et al 2000;Candy et al 2004;Ernst et al 2004), and a program of nonlinear astrophysical turbulence simulations is currently underway.…”
Section: Resultsmentioning
confidence: 99%
“…We also used comparisons with the analytical results from both theories to verify and demonstrate the accuracy of the gyrokinetic simulation code GS2 in the parameter regimes of astrophysical interest. We note that although our tests are linear, GS2 has already been used extensively for nonlinear turbulence problems in the fusion research (e.g., Dorland et al 2000;Jenko et al 2000Rogers et al 2000;Candy et al 2004;Ernst et al 2004), and a program of nonlinear astrophysical turbulence simulations is currently underway.…”
Section: Resultsmentioning
confidence: 99%
“…66,[82][83][84][85][86][87][88][89][90][91][92][93][94] Many other validation studies have assessed the sensitivity of 16 inputs but not explicitly presented the results in the form shown in Fig. 5.…”
Section: Building Robust Local Turbulent Transport Validation Metmentioning
confidence: 99%
“…In some of these cases, nonlinear wavenumber transfers can increase or cause drive, 26,27 while in other cases zonal flow effects decrease drive. 28,29 In order to avoid the pitfalls of relying too heavily on linear stability calculations in forming conclusions on turbulence characteristics, it is useful to perform turbulent simulations and diagnose them with energy dynamics analyses. Energy dynamics analyses track energy input into turbulent fluctuations and energy dissipation out of them.…”
Section: Introductionmentioning
confidence: 99%