US Patent 9462669 Plasma confinement device

A device and method for the magnetic confinement of plasma is formed by a cylindrically stacked column of current-carrying magnetic field coils with electrodes interior to each magnetic field coil so as to induce plasma fluid rotation about an annular confinement region formed of cusped-geometry magnetic fields. Electrodes are formed such that the electric fields produced are tangential to the magnetic fields, and so as to maintain consistent azimuthal direction of plasma rotation, electric field electrodes alternate accordingly in polarity along the axial length of the device.