Beschreibung:
<jats:p>The interaction of magnetic field line stochasticity with drift islands can lead to Arnold diffusion of the drift island centers in a toroidal magnetic field. The basic formulas for this interaction have been derived and the diffusion rate determined. The formalism has been applied to calculating the parallel diffusion of an electron beam, which is subject both to magnetic stochasticity and a time-varying electric field. It is shown that the resulting Arnold diffusion can be readily measurable.</jats:p>