Abstract
It is proposed that the technique of laser-induced fluorescence (LIF) be used to measure local ion velocity distributions in tokamak divertors. Recent theoretical work has indicated the existence of highly populated excited states of many partially stripped ions. These states are often connected to nearby levels by means of visible radiation, allowing useful LIF schemes to be devised. Passive spectroscopic measurements on DIII–D will be presented which verify some of the theoretical predictions. We considered ten Be-like and Mg-like ions and were able to identify over 150 LIF schemes. A possible laser system and experimental layout for the DIII–D tokamak will be presented.
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