SCALING STUDY OF EDGE PLASMA PARAMETERS USING A MULTI-DEVICE DATABASE

A database consisting of edge equilibrium, turbulence and transport re lated plasma parameters has been compiled. Scaling laws for edge densi ty, electron temperature, and radial particle flux are derived in an i nitial study using a subset of data obtained from tokamaks Phaedrus-T, Tokamak de Varennes, TEXT and TEXT-U. A comparison of edge particle t ransport in divertor and limiter plasmas shows that the magnetic topol ogy of a separatrix or a divertor improves particle confinement. The p article diffusion coefficient varies radially in a manner opposite to that of Bohm diffusion.