Role of trapped electron mode turbulence in internal transport barrier control in the Alcator C-Mod Tokamak

By D. Ernst, P. Bonoli, P. Catto, W. Dorland, C. Fiore, R. Granetz, Martin Greenwald, A. Hubbard, M. Porkolab, M. Redi and 2 more. 2004

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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, 2149 (2002)]. Off-axis heating produces an internal particle and energy transport barrier after the transition to enhanced Dα high confinement mode. The barrier foot reaches the half-radius, with a peak density 2.5 times the edge density. While the density profile peaks, the temperature profile remains relatively unaffected. The peaking and concomitant impurity accumulation are controlled by applying modest central heating power late in the discharge. Gyrokinetic turbulence simulations of the barrier formation phase, using the GS2 code [W. Dorland et al., Phys. Rev. Lett. 85, 5579 (2000)] show that toroidal ion temperature gradient driven modes are sup...

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/cf67cdc233285e15b1fae1b544d51d264e572216

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Citations in the corpus

Astrophysical Gyrokinetics: Basic Equations and Linear Theory (2005, background): “…extensively for nonlinear turbulence problems in the fusion research (e.g., Dorland et al. 2000; Jenko et al. 2000, 2001; Rogers et al. 2000; Jenko & Dorland 2001, 2002; Candy et al. 2004; Ernst et al. 2004), and a program of nonlinear astrophysical turbulence simulations is currently underway.”
Foundations of Nonlinear Gyrokinetic Theory (2007, background): “…Villard, Allfrey, et al. 2004 Trapped electron mode Similon and Diamond 1984 Sydora 1990 Gang et al. 1991 Chen and Parker 2001 Hahm and Tang 1991 Ernst et al. 2004 Dannert and Jenko 2005 Trapped-ion mode Hahm and Tang 1996 Depret et al. 2005 Electron-temperature-gradient ETG mode Kim et al.…”