Abstract
A numerical study employing a hybrid computer code (particle ions/fluid electrons) is made of the dynamics of translating ion rings in a highly conductive plasma. The translational kinetic energy of such rings is lost through the generation of Alfvén waves. When the initial axial velocity of the ring is greater than the local Alfvén speed in the plasma, a typical slowing down length is zA =(ar/4ζ)v̄4z0/(v2θv2A), where ar is the ring radial width, ζ=‖δB/B0‖, δB is the ring self-magnetic-field strength on axis, B0 is the strength of the axial magnetic field, v̄z0 is the initial translational velocity of the ring, vθ is the average toroidal ring particle velocity, vA=B0/(4πρ)1/2 is the Alfvén velocity, and ρ is the plasma mass density. Also discussed is the merging of an ion ring with a spheromak.
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