Diagnostics for edge pedestal research (invited)

Edge pedestal research in magnetic plasma confinement devices requires measurements which span multiple spatial and temporal scales and include a number of physical processes. Research seeks to optimize the height of the pedestal for maximum confinement, but to avoid large repetitive particle and heat loads in the divertor as a consequence of edge localized modes (ELMs). In this complex region, transport physics, fueling by neutrals, stability physics, and the physics of the self-driven bootstrap current all play key roles. To develop an understanding of the pedestal region, detailed physics measurements of the local gradients, neutral fueling, the turbulence spectra, and the magnetohydrodynamic characteristics are needed with both fine spatial and temporal resolution. Finally, development of two-dimensional and three-dimensional imaging of the ELM evolution would greatly aid in understanding ELM transport