Time-Resolved Profile Measurements of Impurity Lines in a Theta Pinch Discharge

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Abstract
Line profile measurements were carried out on a small theta pinch experiment in order to get information on the ion motions during the discharge. A FABRY-PEROT interferometer combined with a so-called Fafnir arrangement was used for measuring the shape of the investigated N V (4603 Å) and O VI (3811 Å) lines. The additional use of a polarizer and λ/4 plate made it possible to eliminate ZEEMAN splitting caused by a magnetic field present, which affects the line shape, and to measure the magnitude of the magnetic field strength at the site of line emission in the plasma. By means of a combined system comprising image converter and intensifier the emission regions of the investigated lines in the plasma could be identified. The experimentally obtained results are discussed considering the different influences leading to line broadening in the present experiment.

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