Abstract
The possibility of trapping a plasma in a magnetic field generated by a ring-shaped solid conductor was investigated using a hollow mercury jet as a liquid-conductor model. The jet was formed around a glass-tube sheathed copper rod. It was found that if a sufficiently large current I/sub 0/ is sent through the central rod in the same direction as the current I in the jet, there is no sign of instability. The transition between stability and instability becomes sharper for strong currents and large electrodynamic forces than for weak currents. The transition for currents of 200 to 400 amp seems to occur at I/sub 0/ = 1.37 I. It is not possible to draw conclusions about the stability of a highly ionized plasma from the present results. This is because mercury has a comparatively low electric conductivity and the situation is very far from that of frozen field lines. (B.O.G.)
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