Fast-ion populations in Alcator C-Mod plasma can be detected and localized in space and time via their interaction with a diagnostic neutral beam. A new diagnostic system is being developed to Specifically, super-thermal, fully-stripped ions in a plasma can be detected by observing emission from the singly-ionized ion which are formed by charge exchange of the full-stripped ion in a beam of fast neutrals. This will contribute to two active research areas on C-Mod. One is the validation of the physics models for IC deposition physics via minority ions. (Wave Plasma Interactions) The other is the study of alfven eigenmodes via their diffusive effect on fast ion populations.
Fast Ion Detection Physics
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