• Analysis of neutral particle recycling and pedestal fueling in a H-mode DIII-D discharge 

      Friis, Zachary Ward; Stacey, Weston M.; Leonard, Anthony W.; Rensink, M. E. (Georgia Institute of TechnologyAmerican Institute of Physics, 2010-02-23)
      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 ...
    • Evolution of the H-mode edge pedestal between ELMs 

      Stacey, Weston M.; Groebner, Richard J. (Georgia Institute of TechnologyAmerican Institute of Physics, 2010-08)
      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 ...
    • Experimentally inferred thermal diffusivities in the edge pedestal between edge-localized modes in DIII-D 

      Stacey, Weston M.; Groebner, Richard J. (Georgia Institute of TechnologyAmerican Institute of Physics, 2007-12-11)
      Using temperature and density profiles averaged over the same subinterval of several successive inter-edge-localized-mode (ELM) periods, the ion and electron thermal diffusivities in the edge pedestal were inferred between ...
    • 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, 2010-11-22)
      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 ...
    • 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 ...
    • 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. ...
    • Thermal transport analysis of the edge region in the low and high confinement stages of a DIII-D discharge 

      Stacey, Weston M.; Groebner, Richard J. (Georgia Institute of TechnologyAmerican Institute of Physics, 2007-01-04)
      The ion and electron thermal diffusivities have been inferred from measured density and temperature profiles in the edge of a DIII-D [ J. Luxon, Nucl. Fusion 42, 614 (2002) ] discharge with a low confinement (L-mode) stage ...