Model calculations for a 20 keV neutral lithium diagnostic beam
Electron density and impurity ion concentrations in the edge plasma of tokamak discharges can be determined with excellent spatial and temporal resolution by virtue of a neutral lithium diagnostic beam. Spectroscopic observation of the LiI resonance line, mainly produced by electron collisions, and of characteristic impurity ion lines as induced by electron capture from injected fast Li atoms into excited ion states (Li-induced charge exchange spectroscopy - Li-CXS), delivers raw data from which the above information can be evaluated. Test calculations of Li(2p) profiles using an attenuation code are compared with the result of a complete calculation. To study the effects of l-mixing, model calculations are also performed for occupation numbers in C(3+) ions after electron capture into C(4+). The changing population of two C(3+) 6l substrates with increasing electron density is shown.
Bibliographic Reference: Article: 18th European Conference on Controlled Fusion and Plasma Physics, Vol. IV (1991) pp. 365-367
Record Number: 199111400 / Last updated on: 1994-12-02
Original language: en
Available languages: en