Abstract
In magnetic fusion toroidal confinement devices, the confining magnetic fields may have errors which produce magnetic islands. The standard method of investigating magnetic field errors involves measuring the maximum radial spatial extent of a given magnetic island at a fixed toroidal location and calling this measurement the island width. However, because of magnetic flux conservation inside an island, the spatial width of the island is not toroidally invariant. Magnetic error fields and their associated islands have been investigated in the Compact Auburn Torsatron through the measurement of the local rotational transform about the fixed points of the island. This method of magnetic field error investigation is valid at any poloidal or toroidal angle because the local rotational transform is spatially invariant. The technique of measuring the local rotational transform is described and the results are compared to those obtained using standard methods of measuring island widths.
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