S. Zou, T. Kato, I. Murakami


Charge Exchange Recombination Spectroscopy of Li III Ions for Fusion Plasma Diagnostics

Date of publication:

Oct. 2001

Key words:

Charge exchange (CX), Spectroscopy, Neutral beam (NB), Li III, Zeeman effect


A detailed calculation is presented of the line emission of Li^{2+} ions in a plasma where a neutral hydrogen beam is injected. A collisional-radiative model including charge exchange process has been developed, in which nl subshell resolved populations are treated up to n ~ 20. The population densities are discussed for three components: excitation, recombination and charge exchange processes. The Zeeman effect for fine structure component and apparent broadening for line profiles have been examined by detailed numerical calculations of spectra profiles for the emission lines of Li III ions from n = 5 to n = 4 transitions with a magnetic field B = 2 Tesla. The perturbation of Zeeman broadening on ion temperature measurements is also estimated. At high magnetic field and low ion temperature, Zeeman broadening must be included for reliable interpretation of the measured spectra. Our calculation can be applied to measure the magnetic field in plasmas.

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