Abstract
Particle orbits of impurity ions are calculated in order to estimate their toroidal flow velocity. If the impurity ion flow differs from the ion flow, Doppler shift measurement of impurity spectra requires a suitable modification of experimental results. At the field null, the carbon ion flow coincides with the deuterium ion flow due to the friction force between them. At the separatrix, however, impurity and plasma ions each have their own flow velocities. The diamagnetic drift, which depends on the charge and mass of each fluid species, is found to dominate the toroidal flow velocity.
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