Electrical and magnetic field (J x B) forces can be used to support flowing liquid metal against gravity. In a tokamak, the radial magnetic field gradient implies that JxB decreases inversely as the major radius, for constant current density in the liquid metal. This field gradient produces a pressure gradient along the support wall, which pushes the liquid metal towards the low field side. The invention describes a technique to reduce or reverse this effective pressure gradient by adjusting the electrical conductivity of the supporting wall to increase or decrease the fraction of current carried by the wall relative to the liquid metal.
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