A small theta-pinch plasma gun using two independently energized pinch coils has been developed to study the interaction of a high-beta plasma with magnetic fields. The gun produces a doughnutshaped puff of hydrogen plasma which, in a 2.1 kG longitudinal magnetic (Bz) field, has a density of 1−2 × 1015cm−3, a temperature of 35 eV, and a directed energy of 210 eV. The transverse energy of the puff, limited by flute instabilities during the initial compression phase and entry into the Bz field, is more than three times as large as the output from a more conventional, but comparable, conical gun. A significant amount of the directed plasma energy can be converted to transverse energy by reflecting the plasma from a magnetic barrier.
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R. E. Turner (1970) studied this question.
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