Now showing items 21-40 of 59

    • A framework for the development and testing of an edge pedestal model: formulation and initial comparison with DIII-D data 

      Stacey, Weston M.; Groebner, Richard J. (Georgia Institute of TechnologyAmerican Institute of Physics, 2003-06)
      A framework has been formulated for the further development and testing of a predictive edge pedestal model. This framework combines models for the interaction of the various physical phenomena acting in the edge ...
    • Fusion DEMO Characteristics & Paths to DEMO 

      Stacey, Weston M. (Georgia Institute of Technology, 2007-05-08)
    • A Fusion Transmutation of Waste Reactor 

      Stacey, Weston M.; Mandrekas, John; Hoffman, E. A. (Elisha Albright); Kessler, G. P.; Kirby, C. M.; Mauer, A. N.; Noble, J. J.; Stopp, D. M.; Ulevich, D. S. (Georgia Institute of TechnologyAmerican Nuclear Society, 2002-03)
      A design concept and the performance characteristics for a fusion transmutation of waste reactor (FTWR)—a sub-critical fast reactor driven by a tokamak fusion neutron source--are presented. The present design concept is ...
    • Higher Order Approximations of the TEP Method for Neutral Particle Transport in Edge Plasmas 

      Stacey, Weston M.; Zhang, Dingkang; Mandrekas, John (Georgia Institute of TechnologyAmerican Institute of Physics, 2006)
      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 ...
    • An interface current balance formulation of neutral atom transport theory in plasmas 

      Stacey, Weston M. (Georgia Institute of TechnologyAmerican Institute of Physics, 1997-01)
      An interface current balance (ICB) method for neutral particle transport is presented and specialized to the calculation of neutral atom transport in background plasmas. A multigroup extension of the ICB methodology is ...
    • Interpretation of edge pedestal rotation measurements in DIII-D 

      Stacey, Weston M.; Groebner, Richard J. (Georgia Institute of TechnologyAmerican Institute of Physics, 2008-01-25)
      A novel methodology for inferring experimental toroidal angular momentum transfer rates from measured toroidal rotation velocities and other measured quantities has been developed and applied to analyze rotation measurements ...
    • Interpretation of particle pinches and diffusion coefficients in the edge pedestal of DIII-D H-mode plasmas 

      Stacey, Weston M.; Groebner, Richard J. (Georgia Institute of TechnologyAmerican Institute of Physics, 2009-10-15)
      A procedure is described for evaluating particle pinches to be used in interpreting particle diffusion coefficients from measured density and temperature profiles in the edge pedestal of tokamak plasmas. Application to the ...
    • Investigation of background edge thermal transport in ELMing and ELM-suppressed H-modes in DIII-D 

      Stacey, Weston M.; Evans, T. E. (Georgia Institute of TechnologyAmerican Institute of Physics, 2006-11-17)
      Thermal diffusivities are inferred in the plasma edge of a matched pair of DIII-D [J. Luxon, Nucl. Fusion 42, 614 (2002)] high confinement mode discharges, one with edge localized modes (ELMs) present and the other with ...
    • An investigation of some effects of drifts and magnetic field direction in the scrape-off layer and divertor of tokamak plasmas 

      Stacey, Weston M. (Georgia Institute of TechnologyAmerican Institute of Physics, 2009-04-03)
      Various effects of particle drifts in the scrape-off layer (SOL) and divertor of tokamaks have been calculated. The predictions are consistent with several experimentally observed phenomena, e.g., the double reversal of ...
    • Investigation of transport in the DIII-D edge pedestal 

      Stacey, Weston M. (Georgia Institute of TechnologyAmerican Institute of Physics, 2004-04)
      A comparison of various heat conduction theories with data from several DIII-D [Luxon, Nucl. Fusion, 42, 614, 2002] shots indicates: 1) that neoclassical theory is in somewhat better agreement with experiment than is ion ...
    • Momentum confinement in DIII-D shots with impurities 

      Stacey, Weston M.; Murakami, M. (Georgia Institute of TechnologyAmerican Institute of Physics, 2001-07-05)
      A neoclassical momentum transport model, consisting of gyroviscous and convective components, is applied to the analysis of momentum confinement in DIII-D [Luxon, Anderson, Batty et al., Plasma Physics and Controlled Nuclear ...
    • Neoclassical calculation of poloidal rotation and poloidal density asymmetries in tokamaks 

      Stacey, Weston M. (Georgia Institute of TechnologyAmerican Institute of Physics, 2002-09)
      A previous model for the calculation of poloidal velocities and poloidal density asymmetries in the core of a tokamak plasma is refined and extended by the inclusion of terms which are important for the calculation of these ...
    • A neoclassical calculation of toroidal rotation profiles and comparison with DIII-D measurements 

      Stacey, Weston M.; Johnson, R. W.; Mandrekas, John (Georgia Institute of TechnologyAmerican Institute of Physics, 2006)
      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 ...
    • A neoclassical model for toroidal rotation and the radial electric field in the edge pedestal 

      Stacey, Weston M. (Georgia Institute of TechnologyAmerican Institute of Physics, 2004-06)
      A model for the calculation of toroidal rotation velocities and the radial electric field in the edge pedestal of tokamaks is described. The model is based on particle and momentum balance and the use of the neoclassical ...
    • Neoclassical theory for rotation and impurity transport in tokamaks with neutral beam injection 

      Stacey, Weston M. (Georgia Institute of TechnologyAmerican Institute of Physics, 2001-01)
      A self-consistent, first-principles neoclassical theory for rotation and impurity transport in tokamaks is presented. The implications of this theory for impurity transport in a tokamak are illustrated by a model problem ...
    • Non-Diffusive Transport in the Tokamak Edge Pedestal 

      Stacey, Weston M.; Groebner, Richard J.; Evans, T. E. (Georgia Institute of TechnologyInstitute of Physics, 2012)
      There are (at least) two classical mechanisms for non-diffusive transport in the edge plasma: i) particle “pinch” velocities due to forces such as VxB, and Er; and ii) outward drifts due to ion-orbit loss and X-transport. ...
    • Nuclear design and analysis of the fusion transmutation of waste reactor 

      Stacey, Weston M.; Hoffman, E. A. (Elisha Albright) (Georgia Institute of TechnologyAmerican Nuclear Society, 2004-01)
      The nuclear design and safety analyses for the Fusion Transmutation of Waste Reactor (FTWR) are described. The advantages of sub-critical operation for nuclear stability and safety are illustrated.
    • Nuclear Energy 

      Stacey, Weston M. (Georgia Institute of Technology, 2007-03-15)
    • Nuclear Mission for Fusion (Transmutation, fissle breeding and Pu dispostion) 

      Stacey, Weston M. (Georgia Institute of TechnologyElsevier, 2006)
      There are potential applications of fusion neutron sources to 'drive' sub-critical fission reactors to perform one or more possible 'nuclear' missions. Since only a fraction of the neutrons in these applications would be ...
    • Particle Transport and Density Gradient Scale Lengths in the Edge Pedestal 

      Stacey, Weston M. (Georgia Institute of TechnologyWiley-VCH Verlag, 2004-04)
      A new flux-gradient relation for the ion particle flux in the edge pedestal is derived from continuity and momentum balance, taking into account atomic physics, and cast in the form of a generalized ‘diffusion-pinch’ ...