Abstract
A probe for the measurement of the ion temperature in a strongly magnetized plasma is described. The positive-ion current to a cylindrical probe, whose axis is set parallel to the magnetic field, is calculated in the collision-free regime as a function of the ion temperature and the magnetic-field strength. It is assumed that the electron Larmor radius is negligibly small compared to the radius of the cylinder. Only the ion Larmor radius is treated as finite. The ion temperature can be evaluated from the ratio of ion currents of the two cylindrical electrodes with different lengths, whose surfaces are parallel to the magnetic field. The effect of ion drift along the cylinder axis is also considered. Experiments have been made in the edge plasma of a JFT-2M tokamak to test the above probe for determining plasma parameters during ohmic and NBI heatings.
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