Edge gradient and safety-factor effects on electrostatic turbulent transport in tokamaks

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Abstract
Electrostatic turbulence and transport has been measured in the tokamak edge as the safety factor (and, concomitantly, the energy-confinement time) and the edge equilibrium gradients are varied substantially. The turbulence is largely independent of safety factor, but strongly sensitive to the local-density gradient, which itself depends upon the limiter configuration.