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Fusion Research Center

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Author: Mandrekas, John × Has files: Yes × search.filters.applied.f.isSeriesOfPublicationTitle: Fusion Research Center Annual Report Series × Type: Text × search.filters.applied.f.resourcesubtype: Pre-print ×

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Calculation of toroidal rotation profiles in DIII-D using neoclassical viscosity (DoE Grant ER54538)

2005-10 , Stacey, Weston M. , Johnson, R. W. , Mandrekas, John

Momentum 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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Improvements in the 2D TEP Neutral Particle Transport Calculation in Edge Plasmas (DoE Grant ER54538)

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.

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