Abstract
It is shown that island-induced bootstrap current density, which results from the symmetry breaking of the ∣B∣ when an island is embedded in the equilibrium magnetic field B, modifies the evolution equation and the saturation level for a thin magnetic island in tokamaks. This modification is independent of the fraction of the equilibrium bootstrap current density. It is found that island-induced bootstrap current density increases the saturation level for modes with positive values of Δ′. Here, Δ′ is the stability parameter for the linear tearing modes.
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