The enhancement of the toroidal magnetic flux in a reversed field pinch is studied experimentally in a toroidal plasma device. The perforated shell-type coil used in this experiment enables us to observe the full toroidal plasma by an image-converter camera. It is found that a helical luminous filament appears around the main plasma column only when the toroidal field at the wall of the discharge tube begins to reverse and when the toroidal flux in the tube is enhanced.
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