Destruction of Magnetic Surfaces near a Separatrix of a Stellarator Attributed to Perturbations of Magnetic Fields

The destruction of magnetic surfaces in the vicinity of a separatrix of a stellarator and a torsatron is analyzed. Unperturbed magnetic surfaces formed by a straight helical current and a uniform magnetic field are assumed. Destruction of magnetic surfaces is attributed to perturbations of magnetic fields, which are assumed to be brought from toroidal effects of magnetic fields or discrete structure of magnetic coils, respectively. Analysis is based on “Stochasticity” and a spread of a stochastic layer in the vicinity of the separatrix is calculated.

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