| Abstrakt: |
The paper is concerned with numerical investigation of various magnetic configurations of a single-pole toroidal L = 1, m = 13 'ultimate' torsatron having a low aspect ratio A = 4.345 and the modulation factors (−0.23) ≤ α ≤ 0.71 ( K = 1, β = 0) of the helix law − mφ = θ− αKSin θ− βKSin2 θ. The extremums of the basic properties of closed magnetic surfaces as functions of the coefficient α in the neighborhood of α ≈ 0.4, as well as the structures of the edge magnetic field ( substructures of virtual current) and the separatrix have been first determined for the L = 1, m = 13 'ultimate' torsatrons and the 'Vint-20' torsatron. Unusual positions of the separatrix X-points in the cross sections for 1/4- and 3/4- magnetic field periods have been identified. The formula that takes into account the modulation factor α of the helix law was first derived to determine the average vertical magnetic field on the geometrical axis of the torus. [ABSTRACT FROM AUTHOR] |
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