Browsing Fusion Research Center Publications by Author "Georgia Institute of Technology. Fusion Research Center"
Now showing items 120 of 29

A semiautomated procedure for creating geometry and background plasma input files for the GTNEUT 2d neutral particle transport code using the uedge plasma edge code
Friis, Zachary Ward (Georgia Institute of Technology, 200902)The GTNEUT code13 can provide a computationally economical and accurate calculation of neutral particle transport in the complex 2D geometry to the tokamak divertor, scrapeoff layer and edge regions inside of the ... 
Analysis of neutral particle recycling and pedestal fueling in a Hmode DIIID discharge
Friis, Zachary Ward; Stacey, Weston M.; Leonard, Anthony W.; Rensink, M. E. (Georgia Institute of TechnologyAmerican Institute of Physics, 20100223)A detailed analysis of neutral atom recycling and pedestal fueling in a DIIID _J. Luxon, Nucl. Fusion 42, 614 _2002__ highconfinement mode discharge is presented. Experimental data and twodimensional _2D_ edge plasma ... 
Applications of the Miller equilibrium to extend tokamak computational models
Stacey, Weston M. (Georgia Institute of TechnologyAmerican Institute of Physics, 20081211)An analytical model for the equilibrium flux surface geometry, widely known as the Miller equilibrium model, has been exploited to improve a variety of simplified tokamak computation models that incorporate an approximate ... 
Commentaries on Criticisms of Magnetic Fusion
Stacey, Weston M. (Georgia Institute of Technology, 19990101)This report provides brief commentaries on a representative set of the criticisms of magnetic fusion which have been published over the years and includes annexes which summarize technical information in support of the ... 
The Effect of Ion Orbit Loss and XLoss on the Interpretation of Ion Energy and Particle Transport in the DIIID Edge Plasma
Stacey, Weston M. (Georgia Institute of TechnologyAmerican Institute of Physics, 20111014)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 ... 
Effect on the divertor and scrapeoff layer plasma properties of the distribution of power and particle influxes from the core
Stacey, Weston M. (Georgia Institute of TechnologyAmerican Institute of Physics, 20090325)Calculations of the profiles along the field lines within the divertor and scrapeoff layer (SOL) of differences in the plasma ion density, temperature, parallel current, parallel flow velocity, and electrostatic potential, ... 
The effects of rotation, electric field, and recycling neutrals on determining the edge pedestal density profile
Stacey, Weston M. (Georgia Institute of TechnologyAmerican Institute of Physics, 20100519)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 ... 
Extension and comparison of neoclassical models for poloidal rotation in tokamaks
Stacey, Weston M. (Georgia Institute of TechnologyAmerican Institute of Physics, 20080118)Several neoclassical models for the calculation of poloidal rotation in tokamaks were rederived within a common framework, extended to include additional physics and numerically compared. The importance of new physics ... 
Force Balance and Ion Particle Transport Differences in High and Low Confinement Tokamak Edge Pedestals
Stacey, Weston M.; Groebner, Richard J. (Georgia Institute of TechnologyAmerican Institute of Physics, 20101122)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 DIIID [J. Luxon, Nucl. Fusion 42, 614 (2002)] discharge in order ... 
Fusion DEMO Characteristics & Paths to DEMO
Stacey, Weston M. (Georgia Institute of Technology, 20070508) 
An interface current balance formulation of neutral atom transport theory in plasmas
Stacey, Weston M. (Georgia Institute of TechnologyAmerican Institute of Physics, 199701)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 DIIID
Stacey, Weston M.; Groebner, Richard J. (Georgia Institute of TechnologyAmerican Institute of Physics, 20080125)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 ... 
An investigation of some effects of drifts and magnetic field direction in the scrapeoff layer and divertor of tokamak plasmas
Stacey, Weston M. (Georgia Institute of TechnologyAmerican Institute of Physics, 20090403)Various effects of particle drifts in the scrapeoff layer (SOL) and divertor of tokamaks have been calculated. The predictions are consistent with several experimentally observed phenomena, e.g., the double reversal of ... 
Momentum confinement in DIIID shots with impurities
Stacey, Weston M.; Murakami, M. (Georgia Institute of TechnologyAmerican Institute of Physics, 20010705)A neoclassical momentum transport model, consisting of gyroviscous and convective components, is applied to the analysis of momentum confinement in DIIID [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, 200209)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 ... 
Neoclassical theory for rotation and impurity transport in tokamaks with neutral beam injection
Stacey, Weston M. (Georgia Institute of TechnologyAmerican Institute of Physics, 200101)A selfconsistent, firstprinciples 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 ... 
NonDiffusive 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 nondiffusive transport in the edge plasma: i) particle “pinch” velocities due to forces such as VxB, and Er; and ii) outward drifts due to ionorbit loss and Xtransport. ... 
Nuclear Energy
Stacey, Weston M. (Georgia Institute of Technology, 20070315) 
Poloidal rotation and density asymmetries in a tokamak plasma with strong toroidal rotation
Stacey, Weston M. (Georgia Institute of TechnologyAmerican Institute of Physics, 199210)A neoclassical model for calculating poloidal rotation and poloidal density asymmetries in a tokamak plasma with vϕ∼vth and E/Bθ∼O(1) is developed. Application is made to the analysis of a deuterium plasma with a dominant ... 
Poloidal rotation, density asymmetries, and momentum confinement in tokamak experiments
Stacey, Weston M.; Jackson, D. R. (Georgia Institute of TechnologyAmerican Institute of Physics, 199306)Poloidal rotation speeds and density asymmetries are calculated for the deuterium and dominant carbon (oxygen) impurity ions in discharges in the Axially Symmetric Divertor Experiment (ASDEX) [Proceedings of the 13th ...