Abstract
In experiments on toriodal pinch discharges of moderate energy the stability dependence on the applied voltage, longitudinal magnetic field and initial gas pressure has been studied. A Bessel-function model based on the assumption of a force-free configuration has been found to agree well with the experimentally determined field distributions. Electron temperature determinations have been made from measurements of the hydrogen continuum and the intensity ratio between H β and the continuum. Electron density and ion temperature have been obtained from time resolved profile measurements on H β and impurity lines. The conventional pinch configuration with an internal longitudinal field has been supplemented by an outer reversed field. The application of this field has given a larger compression of the plasma and an increase of the electron temperature by a factor of two or three, but the intermixing of fields is followed by a rapid outward drift of the current channel and a decrease of both temperature and plasma current.
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