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Fusion Research Center
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ItemCalculation of toroidal rotation profiles in DIII-D using neoclassical viscosity (DoE Grant ER54538)(Georgia Institute of Technology, 2005-10) Stacey, Weston M. ; Johnson, R. W. ; Mandrekas, JohnMomentum and particle balance and neoclassical viscosity were applied to calculate the radial profile of toroidal rotation in several DIII-D [J. Luxon, Nucl. Fusion, 42, 614 (2002)] discharges in a variety of energy confinement regimes (Low-mode, Low-mode with Internal Transport Barrier, Highmode, and High-mode with Quiescent Double Barrier). Calculated toroidal rotation velocities were found to over-predict measured values most in the center—by factors of 1.5 to 3--with the over-prediction generally decreasing with increasing radius, for the L, H and ITB mode shots, but the single impurity species approximation could not properly model the multiple Ni and Cu charge states in the QDB shots.
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ItemImprovements in the 2D TEP Neutral Particle Transport Calculation in Edge Plasmas (DoE Grant ER54538)(Georgia Institute of Technology, 2005-10) Zhang, Dingkang ; Mandrekas, John ; Stacey, Weston M.Extensions of the 2D Transmission and Escape Probability neutral particle transport method in treating the spatial non-uniformity of collision sources and neutral energy effects are presented. These extensions have been tested by benchmarks against Monte Carlo calculations for specially designed models and for realistic DIII-D discharges. The comparisons indicate these extensions improve accuracy of the TEP method.