Destruction of Magnetic Surfaces in a Divertor Region Attributed to a Discrete Structure of Magnetic Coils

The destruction of magnetic surfaces near a separatrix of a divertor is analyzed. Unperturbed magnetic surfaces formed by a plasma current and a divertor current are assumed. Destruction of magnetic surfaces is attributed to perturbations of magnetic fields, which are assumed to be brought from discrete structure of magnetic coils. Analysis is based on “Stochasticity” and a spread of divertor region is calculated in terms of a ripple of the magnetic field.

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