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ItemRole of Fusion in the Sustainable Expansion of Nuclear Power(Georgia Institute of Technology, 2011-11-29) Stacey, Weston M.
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ItemThe Effect of Ion Orbit Loss and X-Loss on the Interpretation of Ion Energy and Particle Transport in the DIII-D Edge Plasma(Georgia Institute of Technology, 2011-10-14) Stacey, Weston M.Calculation models are presented for treating ion orbit loss effects in interpretive fluid transport calculations for the tokamak edge pedestal. Both standard ion orbit loss of particles following trapped or passing orbits across the separatrix and the X-loss of particles that are poloidally trapped in a narrow null-Bθ region extending inward from the X-point, where they gradB and curvature drift outward, are considered. Calculations are presented for a representative DIII-D [J. Luxon, Nucl. Fusion 42, 614 (2002)] shot which indicate that ion orbit loss effects are significant and should be taken into account in calculations of present and future experiments.
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ItemTutorial: Principles and Rationale of the Fusion-Fission Hybrid Burner Reactor(Georgia Institute of Technology, 2011-09-13) Stacey, Weston M.The potential advantages of Fusion-Fission Hybrid (FFH) reactors (relative to critical fast reactors) for closing the back end of the nuclear fuel cycle are discussed. The choices of fission and fusion technologies for FFH burner reactors that would fission the transuranics remaining in spent fuel discharged from nuclear power reactors are summarized. The conceptual design and fuel cycle performance of the SABR FFH burner reactor are presented, and a fusion power development schedule with a symbiotic dual FFH path is outlined.
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ItemGeorgia Tech Fusion Research Center Annual Report 2011(Georgia Institute of Technology, 2011-09) Stacey, Weston M. ; Stacey, Weston M.The Georgia Tech wor kon interpretation of the DIII-D experiment and on the development of the fission-fusion hybrid burner reactor (SABR) concept is described.
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ItemForce Balance and Ion Particle Transport Differences in High and Low Confinement Tokamak Edge Pedestals(Georgia Institute of Technology, 2010-11-22) Stacey, Weston M. ; Groebner, Rich J.The various terms in the radial force balance in the edge plasma are evaluated using experimental data from the low (L) and high (H) confinement phase of a DIII-D [J. Luxon, Nucl. Fusion 42, 614 (2002)] discharge in order to investigate the differences in the radial force balance among the several electromagnetic and pressure gradient forces in L-mode and H-mode. The roles of cross-field toroidal momentum transport and of a radial pinch velocity in determining different radial particle fluxes in L-mode and H-mode are elucidated
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ItemAnnual Report 2010: Fusion Research Center, Nuclear and Radiological Engineering Program, Georgia Institute Of Technology(Georgia Institute of Technology, 2010-09) Stacey, Weston M.
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ItemEvolution of the H-mode edge pedestal between ELMs(Georgia Institute of Technology, 2010-08) Stacey, Weston M. ; Groebner, Rich J.The evolution of edge pedestal parameters between edge-localized modes (ELMs) is analyzed for an H-mode DIII-D [J Luxon, Nucl. Fusion 42, 612 (2002)] discharge. Experimental data are averaged over the same sub-intervals between successive ELMs to develop data that characterize the evolution of density, temperature, rotation velocities, etc. over the interval between ELMs. These data are interpreted within the context of the constraints imposed by particle, momentum and energy balance, in particular in terms of the pinch-diffusion relation for radial particle flux that is required by momentum balance. It is found that in the edge pedestal there is an increase of both inward (pinch) electromagnetic and outward (diffusive) pressure gradient forces over the inter-ELM interval.
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ItemThe effects of rotation, electric field, and recycling neutrals on determining the edge pedestal density profile(Georgia Institute of Technology, 2010-05-19) Stacey, Weston M.The edge density profile is calculated from the continuity and momentum balance equations, using experimental electric field and rotation velocities and a calculated recycling neutral source, to evaluate the relative importance of these quantities in determining the observed structure of the edge density profile in a DIII-D _J. Luxon, Nucl. Fusion 42, 614 _2002__ high-confinement mode discharge.
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ItemThe effect of rotation and viscous heating on the interpretation of experimental heat diffusivities in the edge pedestal(Georgia Institute of Technology, 2010-05-17) Stacey, Weston M.A formalism is presented for evaluating the effect of plasma rotation, via viscous heating, on the interpretation of thermal conductivities from measured temperature and density gradients in the edge pedestal. An application to a H-mode DIII-D [ J. Luxon, Nucl. Fusion 42, 614 (2002) ] discharge indicates that the effect could be significant.
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ItemAnalysis of neutral particle recycling and pedestal fueling in a H-mode DIII-D discharge(Georgia Institute of Technology, 2010-02-23) Friis, Zachary Ward ; Stacey, Weston M. ; Leonard, Anthony W. ; Rensink, M. E.A detailed analysis of neutral atom recycling and pedestal fueling in a DIII-D _J. Luxon, Nucl. Fusion 42, 614 _2002__ high-confinement mode discharge is presented. Experimental data and two-dimensional _2D_ edge plasma fluid code calculations are employed to provide ion wall recycling and recombination neutral sources and background edge plasma parameters for a 2D edge neutral code calculation of detailed neutral density, ionization, and charge-exchange distributions throughout the edge pedestal, scrape-off layer and surrounding halo region, divertor, and private flux regions. The effectiveness of the different neutral sources for fueling the confined plasma is evaluated