Toroidal magnetic confinement of non-neutral plasmas

A new method of toroidal non-neutral plasma trap has been developed with applying the chaos-induced radial transport of particles near a magnetic null point. A pure electron plasma is produced by injecting an electron beam. The poloidal gyroradius of an electron at the energy of 1 keV is of order 10 mm, which determines the length scale of the chaotic region. Amongst various applications of toroidal non-neutral plasmas, a possibility of producing very high-beta plasma, which is suitable for advanced fusion, has been examined. The self-electric field of a non-neutral plasma can generate a strong shear flow. When the how velocity is comparable to the Alfven speed (which is smaller than the ion sound speed, if beta > 1), a high-beta equilibrium can be produced in which the plasma pressure is primarily balanced by the dynamic pressure of the how. This configuration is described by a generalized Bernoulli law.