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

Details Numerical Study of Two-fluid Flowing Equilibria of Helicity-driven Spherical Torus Plasmas Numerical Study of Two-fluid Flowing Equilibria of Helicity-driven Spherical Torus Plasmas

2004-10-16

arxiv.org/abs/physics/0410111v1

Physics

Plasma Physics

12th International Congress on Plasma Physics, 25-29 October 2004, Nice (France)

Scientific paper

Two-fluid flowing equilibrium configurations of a helicity-driven spherical torus (HD-ST) are numerically determined by using the combination of the finite difference and the boundary element methods. It is found from the numerical results that electron fluids near the central conductor are tied to an external toroidal field and ion fluids are not. The magnetic configurations change from the high-$q$ HD-ST ($q$>1) with paramagnetic toroidal field and low-$\beta$ (volume average $\beta$ value, ($<\beta>\approx$ 2 %) through the helicity-driven spheromak and RFP to the ultra low-$q$ HD-ST (0

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