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Author: Mandrekas, John × End date: 2006 × Start date: 2006 × Item Type: Publication × search.filters.applied.f.isOrgUnitOfPublicationTitle: George W. Woodruff School of Mechanical Engineering × search.filters.applied.f.resourcesubtype: Pre-print ×

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Higher Order Approximations of the TEP Method for Neutral Particle Transport in Edge Plasmas

2006 , Stacey, Weston M. , Zhang, Dingkang , Mandrekas, John

Higher order approximations, which take into account the effects of angular anisotropy, spatial non-uniformity and energy dependence of the distribution of neutral particles, have been developed and implemented to extend the range of validity of the Transmission and Escape Probabilities (TEP) method for the calculation of neutral particle transport in plasmas. Comparisons with Monte Carlo calculations of model test problems and DIII-D L- and H- mode discharges show that these new extensions significantly improve the accuracy and extend the range of validity of the TEP methodology.

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A neoclassical calculation of toroidal rotation profiles and comparison with DIII-D measurements

2006 , 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 velocity in several DIII-D [J. Luxon, Nucl. Fusion, 42, 614 (2002)] discharges in a variety of energy confinement regimes (Lowmode, Low-mode with Internal Transport Barrier, High-mode, and High-mode with Quiescent Double Barrier). Calculated toroidal rotation velocities generally were found to (over-) predict measured values to well within a factor of 2.

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