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Self-Reversal and Sustainment of Magnetic Fields in Helicity-driven Toroidal Plasmas

In the HIST experiment, self-organizing transition studies between helicity-driven relaxed states of the low-aspectratio toroidal plasmas have been made by means of a rapid reversal of the external toroidal field. Results show that the spherical torus (ST) relaxes towards flipped ST states, which is accompanied by spontaneous reversal of plasma currents. It has been found that an intermittent behavior of the non-flipped region at the outer edge of the flipped ST plasma plays an important role in its current sustainment by coaxial helicity injection.