A signature feature of high confinement (H-mode) tokamak plasmas is the formation of an edge pedestal region in which steep gradients in the density and temperature and wells in the radial electric field and rotation velocity are observed. The structure of and transport in this edge pedestal has been a focus of collaborative research involving Georgia Tech and General Atomics members of the National DIII-D Team.
Stacey, W. M. “A Composite Neoclassical Toroidal Viscosity Model Incorporating Torques from both Axisymmetric and Nonaxisymmetric Tokamak Magnetic Fields”, Fusion Science and Technology (2018) , DOI: 10.1080/15361055.2018.1506626
Stacey, W. M. “A fluid model for the edge pressure pedestal height and width in tokamaks based on the transport constraint of particle, energy, and momentum balance.” Physics of Plasmas 23.6 (2016): 062515
W. M. Stacey and M.T. Schumman. “The distribution of ion orbit loss fluxes of ions and energy from the plasma edge across the last closed flux surface into the scrape-off layer”. Phys. Plasmas 22, 042504 (2015).
W. M. Stacey, M.-H. Sayer, J.-P. Floyd, and R. J. Groebner. “Interpretation of Changes in Diffusive and Non-Diffusive Transport in the Edge Pedestal During Pedestal Buildup Following a Low-High Transition in DIII-D”. Phys. Plasmas 20, 012509 (2013).
W. M. Stacey. “Effect of Ion Orbit Loss on the Structure in the H-Mode Tokamak Edge Pedestal Profiles of Rotation Velocity, Radial Electric Field, Density, and Temperature”. Phys. Plasmas 20 092508 (2013).
J.-P. Floyd and W. M. Stacey. “Numerical Investigation of Extending Diffusion Theory Codes to Solve the Generalized Pinch-Diffusion Equations in the Edge Pedestal”. Fusion Sci. Technol. 61 227-235 (2012).
118897_L_H_mode_thermal_inferrence__summer_06W. M. Stacey and R. J. Groebner, “Thermal transport analysis of the edge region in the low and high confinement stages of a DIII-D discharge”, Phys. Plasmas 14, 012501 (2007).paper