Wall power measurements of impurity radiation in ORMAK

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Abstract
Time- and space-resolved measurements of the power loss to the liner of the Oak Ridge Tokamak (ORMAK) indicate that a large fraction (approx.60%) of the electron power input is lost to the wall, rather than to the limiter. This fraction is relatively constant over a wide range of input powers (ohmic heating plus neutral beam injection) and plasma conditions and for most of the discharge duration. Most of this energy loss is due to impurity radiation from an emission profile having a mean radius about a third that of the limiter radius and is time-correlated with gross plasma fluctuations, internal disruptions, and related spectroscopic impurity signals. In gas puffing experiments resulting in higher densities, the ratio of radiative power to the electron density continually falls as density increases during the course of the discharge.

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