Abstract
The flow of ions through an aperture perpendicular to a strong magnetic field has been calculated for a Maxwellian velocity distribution. The results obtained are needed for the interpretation of time resolved analysis of fluxes using the collecting probe technique and also for in situ mass, energy, and charge state analysis with spectrometers. Moreover, the energy dependent transmission of the aperture can be used to determine ion temperatures. Deuterium, carbon and metal impurity ion temperatures in the limiter shadow plasma of TFR 600 have been evaluated from measured ion flux transmission. For deuterium a temperature of 100 eV was found on the electron side of the collector. At the ion side the temperatures are higher by a factor of two. Impurity ion temperatures are ambiguous to the extent of the knowledge on the charge state. Assuming singly charged ions for Ni + a temperature of 10 eV on the ion side and 4 eV on the electron side was found during high density discharges with an Inconel limiter. In case of a carbon limiter the C + ion temperature on the ion side was about 35 eV.
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