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The propagation of a magnetosonic wave with finite wavelength parallel to the magnetic field in a toroidal plasma is investigated. Measurements at a small pulsed experiment with a Tokamak like configuration and typical plasma parameters n e =2*10 14 cm -3 , T e =10 eV are reported. The wave is coupled to the plasma by an antenna structure consisting of 4 single turn coils symmetrically located around the torus. Comparison of the experimental results with a simplified MHD-theory leads to the conclusion, that this antenna excites a hydromagnetic wave with a comparatively simple mode structure which allows to deduce information on plasma density and effective collision frequency from external measurements of the wave field.
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Hahnekamp et al. (1981) studied this question.
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