Abstract
The behavior of magnetic line of force in a stellarator-type toroidal device with three dimensional helical magnetic axis (Asperator NP-3) is investigated both numerically and analytically, especially taking into account of the toroidal perturbation. To avoid or decrease the influence of the crucial 2/3 resonance, the absolute value of ellipticity of magnetic surface e should be over 1/3, or both e and triangularity Q should be near zero simultaneously. The swing δ employed in the helical windings is revealed to be very effective to the structure of magnetic surface.
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