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Measurement of a helical Pfirsch–Schlüter current with reduced magnitude in HSX

Measurements of the helical rotation and the reduction of the magnitude of the Pfirsch–Schlüter current compared to an equivalent tokamak are reported in a device that has quasihelical symmetry. The Pfirsch–Schlüter current is helical due to the lack of toroidal curvature, and is reduced in magnitude by the high effective transform. A 3D equilibrium reconstruction based on magnetic diagnostics agrees well with the profiles measured with Thomson scattering and diamagnetic flux loop measurements.