Abstract
Charged particle orbits are investigated in a torsatron with the complicated magnetic-field harmonic spectrum when distant, high-order harmonics are present. The structure of the local magnetic wells in such a torsatron is considered. Conditions for the appearance of the additional local magnetic wells along the field line (toroidal-ripple wells) due to the distant harmonics effect are obtained. It is shown that in a torsatron, the particles which are trapped in such wells have the largest radial deviations among all types of trapped particles. The analytical conditions under which the toroidal-ripple wells are dangerous for the particle confinement (criteria of the strong toroidal-field ripple) are derived.
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