Abstract

A potassium-ion plasma forms in a Q-machine with mirror magnetic fields at the hotplates. Discontinuity in the thermoelectric potential at the hotplate edge produces a strong localized radial electric field that both electrostatically confines the ions and creates a high-velocity rotating annulus. Neglecting time-dependent losses, the radial equilibrium in the collisional regime with the column radius comparable to the ion gyro radius is adequately described by an isothermal single-fluid model, including both ion viscosity and rotational inertia. The radial density profiles are consistent with classical diffusion at the column edge.

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