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Two-fluid flowing equilibrium configurations of a helicity-driven sphericaltorus (HD-ST) are numerically determined by using the combination of the finitedifference and the boundary element methods. It is found from the numericalresults that electron fluids near the central conductor are tied to an externaltoroidal field and ion fluids are not. The magnetic configurations change fromthe high-$q$ HD-ST ($q$>1) with paramagnetic toroidal field and low-$\beta$(volume average $\beta$ value, ($<\beta>\approx$ 2 %) through thehelicity-driven spheromak and RFP to the ultra low-$q$ HD-ST (0<q<1) withdiagmagnetic toroidal field and high-$\beta$ ($\beta\approx 18\%) as theexternal toroidal field at the inner edge region decreases and reverses thesign. The two-fluid effecs are more significant in this equilibrium transitionwhen the ion diagmagnetic drift is dominant in the flowing two-fluid.Comment: 12th International Congress on Plasma Physics, 25-29 October 2004,  Nice (France

Two-fluid Flowing Equilibria of Helicity-driven Spherical Torus Plasmas