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Fusion Research Center Annual Report Series

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Author: Mandrekas, John × End date: 2009 × Start date: 2003 ×

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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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Next-Step Option Physics (Grant ER54350)

2004-10 , Stacey, Weston M. , Mandrekas, John , Hoffman, E. A. (Elisha Albright)

For more than a decade we have been involved in physics and design analysis of possible nextstep tokamak options, including first ITER, later FIRE and most recently a tokamak neutron source for a near-term transmutation reactor for burning the transuranics in spent nuclear fuel. We have also recently supported the National Transport Code Coordination activity under this grant. In recent years, much of the effort has been devoted to defining the physics and performance characteristics required of a tokamak fusion neutron source that could drive a sub-critical reactor for the transmutation of the transuranics in spent nuclear fuel. This document provides a final report for the activity in each of these areas for the last grant period.

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Theory, Analysis and Code Development

2003-12 , Stacey, Weston M. , Mandrekas, John , Zhang, Dingkang , Umansky, Maxim V. , Rognlien, Thomas D.

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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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Collaborative Analysis of DIII-D (DoE Grant ER54538)

2004-10 , Stacey, Weston M. , Mandrekas, John

The collaboration of the Georgia Tech Fusion Research Center in the analysis and interpretation of DIII-D experiments as part of the national DIII-D Team began in 1998 under support from General Atomics and has continued since 1999 under support of DoE OFES (Grant DE-FG02-ER54538). This analysis and interpretation of DIII-D experiments has been closely integrated with the ongoing, internally supported code and theory development in the Georgia Tech Fusion Research Center, and results of both efforts are discussed in this section without distinction. The principal areas of experimental analysis and interpretation have been: 1) the physics of the edge pedestal; 2) density limits caused by thermal instabilities in the plasma edge; 3) plasma rotation; 4) neutral atom fueling and recycling in the plasma edge; and 5) impurity transport in general and the radiating mantle in particular.

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Next-step option design studies (DOE GRANT ER54350)

2003-12 , Stacey, Weston M. , Mandrekas, John

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2004 Annual Report Fusion Research Center, Georgia Institute of Technology [Title page]

2004-10 , Stacey, Weston M. , Mandrekas, John

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Analysis of DIII-D Experiments (DOE GRANT ER54538)

2003-12 , Stacey, Weston M. , Mandrekas, John , Groebner, Rich J. , Petrie, Thomas W. , Colchin, Richard J.

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